python3 code raises a different type of exception..

git-svn-id: https://xpra.org/svn/Xpra/trunk@21897 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/clipboard/clipboard_base.py

@@ -819,7 +819,7 @@ def nodata():
         if not self._have_token:
             try:
                 return gtk.Invisible.do_selection_get(self, selection_data, info, time)
-            except NotImplementedError as e:
+            except Exception as e:
                 log("gtk.Invisible.do_selection_get", exc_info=True)
                 if first_time("selection-%s-not-implemented" % self._selection):
                     log.warn("Warning: limited clipboard support for %s", self._selection)