Fix: 'NoneType' object has no attribute 'isinstance'
Fix: 'NoneType' object has no attribute 'isinstance'

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