Minor code generation fixes in source.py
Minor code generation fixes in source.py

TU-Berlin-DIMA/myriad-toolkit,TU-Berlin-DIMA/myriad-toolkit,codeaudit/myriad-toolkit,codeaudit/myriad-toolkit,codeaudit/myriad-toolkit,codeaudit/myriad-toolkit,TU-Berlin-DIMA/myriad-toolkit