[FAB-1931] QSCC GetQueryResult not valid

JSON produced by GetQueryResult() is not valid if there
are multiple records returned.  Need to add a comma
before each JSON member (except for the first).

Change-Id: I1d7586f888674a2251fa5578b1bc00faa3a73dbc
Signed-off-by: denyeart <enyeart@us.ibm.com>

core/scc/qscc/querier.go

@@ -150,10 +150,16 @@ func getQueryResult(vledger ledger.PeerLedger, query []byte) (res pb.Response) {
  buffer.WriteString("[")
 
  var qresult ledger.QueryResult
+ bArrayMemberAlreadyWritten := false
  qresult, err = ri.Next()
  for r := 0; qresult != nil && err == nil && r < limit; r++ {
  if qr, ok := qresult.(*ledger.QueryRecord); ok {
+ // Add a comma before array members, suppress it for the first array member
+ if bArrayMemberAlreadyWritten == true {
+ buffer.WriteString(",")
+ }
  collectRecord(&buffer, qr)
+ bArrayMemberAlreadyWritten = true
  }
  qresult, err = ri.Next()
  }