fix another IndexError, due to empty files (e.g. __init__.py)
fix another IndexError, due to empty files (e.g. __init__.py)

flurischt/jedi,tjwei/jedi,flurischt/jedi,mfussenegger/jedi,dwillmer/jedi,tjwei/jedi,WoLpH/jedi,mfussenegger/jedi,dwillmer/jedi,WoLpH/jedi,jonashaag/jedi,jonashaag/jedi