CLI panics on domain update when domain doesn't exist

[mfateev]

maxim-C02R910HG8WM:cadence maximfateev$ ./cadence -do sample domain update -rd 1
Domain sample does not exist.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x166927a]

goroutine 1 [running]:
github.com/uber/cadence/vendor/go.uber.org/cadence/.gen/go/shared.(*DomainInfo).GetDescription(...)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/go.uber.org/cadence/.gen/go/shared/types.go:8399
github.com/uber/cadence/tools/cli.UpdateDomain(0xc420091080)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/tools/cli/commands.go:208 +0x20a
github.com/uber/cadence/tools/cli.newDomainCommands.func2(0xc420091080)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/tools/cli/domain.go:76 +0x2b
github.com/uber/cadence/vendor/github.com/urfave/cli.HandleAction(0x16f4fa0, 0x186b6e8, 0xc420091080, 0xc420068d00, 0x0)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/app.go:493 +0x7c
github.com/uber/cadence/vendor/github.com/urfave/cli.Command.Run(0x182b685, 0x6, 0x0, 0x0, 0xc4202c3f00, 0x2, 0x2, 0x183de0f, 0x1f, 0x0, ...)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/command.go:212 +0xa95
github.com/uber/cadence/vendor/github.com/urfave/cli.(*App).RunAsSubcommand(0xc420081a00, 0xc420090dc0, 0x0, 0x0)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/app.go:380 +0xa7b
github.com/uber/cadence/vendor/github.com/urfave/cli.Command.startApp(0x182aea5, 0x6, 0x0, 0x0, 0xc4203648e0, 0x1, 0x1, 0x1836afa, 0x16, 0x0, ...)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/command.go:299 +0x920
github.com/uber/cadence/vendor/github.com/urfave/cli.Command.Run(0x182aea5, 0x6, 0x0, 0x0, 0xc4203648e0, 0x1, 0x1, 0x1836afa, 0x16, 0x0, ...)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/command.go:98 +0x13cf
github.com/uber/cadence/vendor/github.com/urfave/cli.(*App).Run(0xc420081860, 0xc420010070, 0x7, 0x7, 0x0, 0x0)
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/vendor/github.com/urfave/cli/app.go:256 +0x6f8
main.main()
/Users/maximfateev/cadencedemo/src/github.com/uber/cadence/cmd/tools/cli/main.go:33 +0x4b
maxim-C02R910HG8WM:cadence maximfateev$