[RSyncManager] Remove raising error when can't remove empty folders and only keep log error.

orangecontrib/tomwer/core/RSyncManager.py

@@ -254,8 +254,7 @@ class _RSyncThread(OWClient, qt.QThread):
                 mess = 'fail to remove file on %s.' % self._source
                 mess += 'Synchronisation might have failed'
                 logger.error(mess)
-                raise OSError(mess)
-
+                
         self.sigSyncThreadFinished.emit(self._source, self._target)
 
     @staticmethod