Path: fix crash on edit

Many Path object forward its editing operation to the job object. It is
possible that some editing option change may lead to removing of the
editing object (e.g. changing stock type) causing crash. It is possible
to just open the task panel without setting any editing object by
returning False in ViewProvider.setEdit()

src/Mod/Path/PathScripts/PathIconViewProvider.py

@@ -78,7 +78,7 @@ class ViewProvider(object):
         # pylint: disable=unused-argument
         if 0 == mode:
             self._onEditCallback(True)
-        return True
+        return False
 
     def unsetEdit(self, arg1, arg2):
         # pylint: disable=unused-argument