Fix inconsistencies and bugs in config.get and config.get_for_repo.
Fix inconsistencies and bugs in config.get and config.get_for_repo.

gauribhoite/personfinder,AwesomeTurtle/personfinder,gauribhoite/personfinder,g19-hs/personfinder,g19-hs/personfinder,google/personfinder,clobrano/personfinder,ominux/personfinder,clobrano/personfinder,AwesomeTurtle/personfinder,google/personfinder,groschovskiy/personfinder,lucasmoura/personfinder,gauribhoite/personfinder,AwesomeTurtle/personfinder,kspviswa/personfinder,gimite/personfinder,kspviswa/personfinder,ominux/personfinder,gauribhoite/personfinder,namanjain236/personfinder,namanjain236/personfinder,google/personfinder,gimite/personfinder,gimite/personfinder,lucasmoura/personfinder,clobrano/personfinder,gauribhoite/personfinder,groschovskiy/personfinder,google/personfinder,gimite/personfinder,gauribhoite/personfinder