Fixed a small bug in source.py after adding support for multi-hop field paths.
Fixed a small bug in source.py after adding support for multi-hop field paths.

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