JSON-RPC EthereumApi.Create panic on some contracts

This simple contract works fine through EthereumApi.Create

```
{"id":1,"method":"EthereumApi.Create","params":[{"init":"store[this.origin()] = 10^20","body":"return lambda { string category = this.data[0] string url = this.data[1] big budget = this.data[3] string header = this.data[4] string body = this.data[5] string image = this.data[6] }","value":"300","gas":"1000000000","gasprice":"20"}]}
```

This one causes a panic:

```
{"id":1,"method":"EthereumApi.Create","params":[{"init":"store[this.origin()] = 10^20","body":"return lambda {  big to = this.data[0] big from = this.origin() big value = this.data[1] if store[from] > value { store[from] = store[from] - value store[to] = store[to] + value }}","value":"300","gas":"1000000000","gasprice":"20"}]}
```

Stack trace

```
$ ethereal
2014/05/31 09:12:50 UPnP failed write udp4: i/o timeout
2014/05/31 09:12:50 [CHAIN] Last known block height #2736
2014/05/31 09:12:50 Last block: 9b13dd99f2c6422dcf223bbaf9860950771ee2b439dc51e7ca8660b663fc533e
2014/05/31 09:12:50 Starting Ethereum GUI v0.5.0 RC11
2014/05/31 09:12:50 [JSON] Starting JSON-RPC server
2014/05/31 09:12:50 Ready and accepting connections
2014/05/31 09:12:50 [SERV] Retrieving seed nodes
2014/05/31 09:12:50 [SERV] Found DNS Go Peer: 94.242.229.217:30303
2014/05/31 09:12:50 [SERV] Adding peer (94.242.229.217:30303) 1 / 10
2014/05/31 09:12:51 [SERV] Found DNS Bootstrap Peer: 54.200.139.158:30303
2014/05/31 09:12:51 [SERV] Adding peer (54.200.139.158:30303) 2 / 10
2014/05/31 09:12:52 Requesting blockchain 9b13dd99... from peer 94.242.229.217:30303
2014/05/31 09:12:52 [PEER] [connected] (outbound) 94.242.229.217:30303  [Peer discovery | Block chain relaying | Transaction relaying]
2014/05/31 09:12:52 [GUI] Starting GUI
2014/05/31 09:12:53 [PEER] Found canonical block, returning chain from: 9b13dd99f2c6422dcf223bbaf9860950771ee2b439dc51e7ca8660b663fc533e
2014/05/31 09:12:59 [JSON] Incoming request.
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x18 pc=0x41f0a96]

goroutine 27 [running]:
runtime.panic(0x4476f60, 0x4a10079)
    /usr/local/go/src/pkg/runtime/panic.c:266 +0xb6
github.com/obscuren/mutan.(*CodeGen).getArray(0x19b8ef18, 0xc210df9cc0, 0xc211b46f80, 0x0, 0x0)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:178 +0x166
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b8ef18, 0xc210df9cc0, 0xc211b46f00)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:679 +0x4e6a
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b8ef18, 0xc210cbe1e0, 0xc211b46900)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:511 +0x1664
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b8ef18, 0xc21135e060, 0xc211b46900)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:390 +0x8f6
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b8ef18, 0xc21135e0c0, 0xc211b21ea0)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:360 +0x1c8
github.com/obscuren/mutan.CompileStage(0x11cd2a30, 0xc211467880, 0x6c1fb00, 0x0, 0x0, ...)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/compiler.go:205 +0x41e
github.com/obscuren/mutan.Compile(0x11cd2a30, 0xc211467880, 0xc20fe4b900, 0x0, 0x0, ...)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/compiler.go:225 +0x7f
github.com/obscuren/mutan.(*CodeGen).compileLambda(0x19b707a0, 0x0, 0xc211ba3d80, 0x43b55e0, 0xc211c47d10)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:826 +0x9f
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b707a0, 0xc211ba3de0, 0xc211b46600)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:764 +0x385f
github.com/obscuren/mutan.(*CodeGen).MakeIntCode(0x19b707a0, 0xc210df9000, 0xc211b21d50)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/int_code.go:360 +0x1c8
github.com/obscuren/mutan.CompileStage(0x11cd2a30, 0xc2114676e0, 0x6c1fb00, 0x0, 0x0, ...)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/compiler.go:205 +0x41e
github.com/obscuren/mutan.Compile(0x11cd2a30, 0xc2114676e0, 0x4a30300, 0x0, 0x0, ...)
    /Users/aeufemio/go/src/github.com/obscuren/mutan/compiler.go:225 +0x7f
github.com/ethereum/eth-go/ethutil.Compile(0xc211bad540, 0xb4, 0x44faa60, 0x2, 0x0, ...)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethutil/script.go:11 +0xa4
github.com/ethereum/eth-go/ethpub.(*PEthereum).createTx(0xc2109d29c0, 0xc2112d2d20, 0x40, 0x44f99a0, 0x0, ...)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethpub/pub.go:147 +0x861
github.com/ethereum/eth-go/ethpub.(*PEthereum).Create(0xc2109d29c0, 0xc2112d2d20, 0x40, 0xc211567288, 0x3, ...)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethpub/pub.go:96 +0xc8
github.com/ethereum/eth-go/ethrpc.(*EthereumApi).Create(0xc210000070, 0xc210c25070, 0xc211c47c80, 0x0, 0x0)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethrpc/packages.go:140 +0xeb
reflect.Value.call(0x4435dc0, 0x44d01d0, 0x130, 0x44fbfe0, 0x4, ...)
    /usr/local/go/src/pkg/reflect/value.go:474 +0xe0b
reflect.Value.Call(0x4435dc0, 0x44d01d0, 0x130, 0x19b70ee8, 0x3, ...)
    /usr/local/go/src/pkg/reflect/value.go:345 +0x9d
net/rpc.(*service).call(0xc2109d9000, 0xc2100847c0, 0xc2113a9050, 0xc210049200, 0xc211e0b180, ...)
    /usr/local/go/src/pkg/net/rpc/server.go:381 +0x159
created by net/rpc.(*Server).ServeCodec
    /usr/local/go/src/pkg/net/rpc/server.go:452 +0x3bb

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc211e467c4)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/sema.goc:199 +0x30
sync.(*Mutex).Lock(0xc211e467c0)
    /usr/local/go/src/pkg/sync/mutex.go:66 +0xd6
github.com/go-qml/qml.(*Window).Wait(0xc21000a210)
    /Users/aeufemio/go/src/github.com/go-qml/qml/qml.go:892 +0x9b
github.com/ethereum/go-ethereum/ethereal/ui.(*Gui).Start(0xc2109f1780, 0xc21003866d, 0x46)
    /Users/aeufemio/go/src/github.com/ethereum/go-ethereum/ethereal/ui/gui.go:102 +0x624
main.main()
    /Users/aeufemio/go/src/github.com/ethereum/go-ethereum/ethereal/ethereum.go:141 +0x9af

goroutine 3 [syscall]:
os/signal.loop()
    /usr/local/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
created by os/signal.init·1
    /usr/local/go/src/pkg/os/signal/signal_unix.go:27 +0x31

goroutine 4 [syscall]:
runtime.goexit()
    /usr/local/go/src/pkg/runtime/proc.c:1394

goroutine 6 [syscall]:
github.com/go-qml/qml._Cfunc_applicationExec(0x4a3ab48)
    github.com/go-qml/qml/_obj/_cgo_defun.c:69 +0x31
github.com/go-qml/qml.guiLoop()
    /Users/aeufemio/go/src/github.com/go-qml/qml/bridge.go:43 +0x132
created by github.com/go-qml/qml.Init
    /Users/aeufemio/go/src/github.com/go-qml/qml/qml.go:44 +0xa0

goroutine 7 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).compactionError(0xc210083900)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_compaction.go:115 +0x1c5
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:114 +0x402

goroutine 8 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).compaction(0xc210083900)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_compaction.go:437 +0x75f
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:117 +0x443

goroutine 9 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).writeJournal(0xc210083900)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_write.go:36 +0x142
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:118 +0x45a

goroutine 11 [select]:
github.com/ethereum/eth-go/ethchain.(*TxPool).queueHandler(0xc2100387e0)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethchain/transaction_pool.go:184 +0x2c8
created by github.com/ethereum/eth-go/ethchain.(*TxPool).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethchain/transaction_pool.go:255 +0x2e

goroutine 12 [IO wait]:
net.runtime_pollWait(0x6c2aba0, 0x72, 0x0)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/netpoll.goc:116 +0x6a
net.(*pollDesc).Wait(0xc2109d4ed0, 0x72, 0x6c28120, 0x23)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x34
net.(*pollDesc).WaitRead(0xc2109d4ed0, 0x23, 0x6c28120)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:86 +0x30
net.(*netFD).accept(0xc2109d4e70, 0x45ea8d0, 0x0, 0x6c28120, 0x23)
    /usr/local/go/src/pkg/net/fd_unix.go:382 +0x2c2
net.(*TCPListener).AcceptTCP(0xc210000a20, 0x4135363, 0xb1c3f20, 0x4135363)
    /usr/local/go/src/pkg/net/tcpsock_posix.go:233 +0x47
net.(*TCPListener).Accept(0xc210000a20, 0xc2113a9010, 0xc2113a9010, 0x11cd2820, 0xc2113a9010)
    /usr/local/go/src/pkg/net/tcpsock_posix.go:243 +0x27
github.com/ethereum/eth-go/ethrpc.(*JsonRpcServer).Start(0xc2100471e0)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethrpc/server.go:42 +0x12b
created by github.com/ethereum/go-ethereum/utils.DoRpc
    /Users/aeufemio/go/src/github.com/ethereum/go-ethereum/utils/cmd.go:18 +0x180

goroutine 13 [chan receive]:
github.com/ethereum/eth-go/ethrpc.(*JsonRpcServer).exitHandler(0xc2100471e0)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethrpc/server.go:22 +0x4a
created by github.com/ethereum/eth-go/ethrpc.(*JsonRpcServer).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethrpc/server.go:37 +0xd2

goroutine 14 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).compactionError(0xc210083d80)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_compaction.go:115 +0x1c5
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:114 +0x402

goroutine 15 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).compaction(0xc210083d80)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_compaction.go:437 +0x75f
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:117 +0x443

goroutine 16 [select]:
github.com/syndtr/goleveldb/leveldb.(*DB).writeJournal(0xc210083d80)
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db_write.go:36 +0x142
created by github.com/syndtr/goleveldb/leveldb.openDB
    /Users/aeufemio/go/src/github.com/syndtr/goleveldb/leveldb/db.go:118 +0x45a

goroutine 17 [IO wait]:
net.runtime_pollWait(0x6c2aaf8, 0x72, 0x0)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/netpoll.goc:116 +0x6a
net.(*pollDesc).Wait(0xc210e5b220, 0x72, 0x6c28120, 0x23)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x34
net.(*pollDesc).WaitRead(0xc210e5b220, 0x23, 0x6c28120)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:86 +0x30
net.(*netFD).accept(0xc210e5b1c0, 0x45ea8d0, 0x0, 0x6c28120, 0x23)
    /usr/local/go/src/pkg/net/fd_unix.go:382 +0x2c2
net.(*TCPListener).AcceptTCP(0xc210000d90, 0x0, 0x0, 0x0)
    /usr/local/go/src/pkg/net/tcpsock_posix.go:233 +0x47
net.(*TCPListener).Accept(0xc210000d90, 0x0, 0x0, 0x0, 0x0)
    /usr/local/go/src/pkg/net/tcpsock_posix.go:243 +0x27
github.com/ethereum/eth-go.(*Ethereum).peerHandler(0xc21007d2c0, 0x6c2af70, 0xc210000d90)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethereum.go:429 +0x2d
created by github.com/ethereum/eth-go.(*Ethereum).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethereum.go:356 +0x2a5

goroutine 18 [chan receive]:
github.com/ethereum/eth-go.(*Ethereum).ReapDeadPeerHandler(0xc21007d2c0)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethereum.go:338 +0x67
created by github.com/ethereum/eth-go.(*Ethereum).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethereum.go:364 +0x18e

goroutine 23 [select]:
github.com/ethereum/go-ethereum/ethereal/ui.(*Gui).update(0xc2109f1780)
    /Users/aeufemio/go/src/github.com/ethereum/go-ethereum/ethereal/ui/gui.go:244 +0xdb5
created by github.com/ethereum/go-ethereum/ethereal/ui.(*Gui).showWallet
    /Users/aeufemio/go/src/github.com/ethereum/go-ethereum/ethereal/ui/gui.go:133 +0x103

goroutine 20 [IO wait]:
net.runtime_pollWait(0x6c2a9a8, 0x77, 0x0)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/netpoll.goc:116 +0x6a
net.(*pollDesc).Wait(0xc2109d40d0, 0x77, 0x6c28120, 0x24)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x34
net.(*pollDesc).WaitWrite(0xc2109d40d0, 0x24, 0x6c28120)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:90 +0x30
net.(*netFD).connect(0xc2109d4070, 0x0, 0x0, 0x6c29c60, 0xc2109f3020, ...)
    /usr/local/go/src/pkg/net/fd_unix.go:86 +0x166
net.(*netFD).dial(0xc2109d4070, 0x6c2afa8, 0x0, 0x6c2afa8, 0xc2100862d0, ...)
    /usr/local/go/src/pkg/net/sock_posix.go:121 +0x2fd
net.socket(0x45171e0, 0x3, 0x2, 0x1, 0x0, ...)
    /usr/local/go/src/pkg/net/sock_posix.go:91 +0x40b
net.internetSocket(0x45171e0, 0x3, 0x6c2afa8, 0x0, 0x6c2afa8, ...)
    /usr/local/go/src/pkg/net/ipsock_posix.go:136 +0x161
net.dialTCP(0x45171e0, 0x3, 0x0, 0xc2100862d0, 0xecb1bcc71, ...)
    /usr/local/go/src/pkg/net/tcpsock_posix.go:155 +0xef
net.dialSingle(0x45171e0, 0x3, 0xc2109f3b80, 0x14, 0x0, ...)
    /usr/local/go/src/pkg/net/dial.go:225 +0x3d8
net.func·015(0xecb1bcc71, 0x68335f, 0x4a31a00, 0x6fc23ac00, 0xecb1bcc71, ...)
    /usr/local/go/src/pkg/net/dial.go:158 +0xde
net.dial(0x45171e0, 0x3, 0x6c2af40, 0xc2100862d0, 0xb543e38, ...)
    /usr/local/go/src/pkg/net/fd_unix.go:40 +0x45
net.(*Dialer).Dial(0xc2109d5080, 0x45171e0, 0x3, 0xc2109f3b80, 0x14, ...)
    /usr/local/go/src/pkg/net/dial.go:165 +0x3e0
net.DialTimeout(0x45171e0, 0x3, 0xc2109f3b80, 0x14, 0x6fc23ac00, ...)
    /usr/local/go/src/pkg/net/dial.go:145 +0xaa
github.com/ethereum/eth-go.func·010()
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:168 +0x5f
created by github.com/ethereum/eth-go.NewOutboundPeer
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:182 +0x14f

goroutine 21 [select]:
github.com/ethereum/eth-go.(*Peer).HandleOutbound(0xc21006f300)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:226 +0x246
created by github.com/ethereum/eth-go.(*Peer).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:507 +0x2a0

goroutine 22 [sleep]:
time.Sleep(0x1dcd6500)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/time.goc:31 +0x31
github.com/ethereum/eth-go.(*Peer).HandleInbound(0xc21006f300)
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:268 +0x5f
created by github.com/ethereum/eth-go.(*Peer).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/peer.go:509 +0x2ba

goroutine 26 [IO wait]:
net.runtime_pollWait(0x6c2a900, 0x72, 0x0)
    /private/var/folders/00/0sdwh000h01000cxqpysvccm0035qk/T/makerelease023741545/go/src/pkg/runtime/netpoll.goc:116 +0x6a
net.(*pollDesc).Wait(0xc2111000d0, 0x72, 0x6c28120, 0x23)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x34
net.(*pollDesc).WaitRead(0xc2111000d0, 0x23, 0x6c28120)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:86 +0x30
net.(*netFD).Read(0xc211100070, 0xc210052c02, 0x5fe, 0x5fe, 0x0, ...)
    /usr/local/go/src/pkg/net/fd_unix.go:204 +0x2a0
net.(*conn).Read(0xc2113a9010, 0xc210052c02, 0x5fe, 0x5fe, 0x2, ...)
    /usr/local/go/src/pkg/net/net.go:122 +0xc5
encoding/json.(*Decoder).readValue(0xc210b8f000, 0x406e504, 0xc2114675c0, 0x55550000)
    /usr/local/go/src/pkg/encoding/json/stream.go:124 +0x4af
encoding/json.(*Decoder).Decode(0xc210b8f000, 0x44515c0, 0xc211427020, 0xd203, 0x6c1fbf0)
    /usr/local/go/src/pkg/encoding/json/stream.go:44 +0x57
net/rpc/jsonrpc.(*serverCodec).ReadRequestHeader(0xc211427000, 0xc2114675c0, 0x40690b5, 0xc210e83000)
    /usr/local/go/src/pkg/net/rpc/jsonrpc/server.go:66 +0x7b
net/rpc.(*Server).readRequestHeader(0xc2100847c0, 0x11cd28d0, 0xc211427000, 0x0, 0x0, ...)
    /usr/local/go/src/pkg/net/rpc/server.go:551 +0x9b
net/rpc.(*Server).readRequest(0xc2100847c0, 0x11cd28d0, 0xc211427000, 0xc210049200, 0xc211e0b180, ...)
    /usr/local/go/src/pkg/net/rpc/server.go:518 +0xa0
net/rpc.(*Server).ServeCodec(0xc2100847c0, 0x11cd28d0, 0xc211427000)
    /usr/local/go/src/pkg/net/rpc/server.go:437 +0x66
net/rpc.ServeCodec(0x11cd28d0, 0xc211427000)
    /usr/local/go/src/pkg/net/rpc/server.go:638 +0x3e
net/rpc/jsonrpc.ServeConn(0x11cd2820, 0xc2113a9010)
    /usr/local/go/src/pkg/net/rpc/jsonrpc/server.go:135 +0x49
created by github.com/ethereum/eth-go/ethrpc.(*JsonRpcServer).Start
    /Users/aeufemio/go/src/github.com/ethereum/eth-go/ethrpc/server.go:48 +0x323
```


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JSON-RPC EthereumApi.Create panic on some contracts #71

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JSON-RPC EthereumApi.Create panic on some contracts #71

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