Don't crash finding ramp in corrupted installs
Don't crash finding ramp in corrupted installs

* Add extra null checks to prevent crashes on systems where
  a faulty ramp uninstallation has corrupted the registry

gmartin7/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso