wxGUI/vdigit: close settings dialog properly (merge from trunk, https://trac.osgeo.org/grass/changeset/32638)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@32639 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/vdigit.py

@@ -2124,7 +2124,8 @@ class VDigitSettingsDialog(wx.Dialog):
         self.parent.toolbars['vdigit'].settingsDialog = None
         self.Close()
 
-        event.Skip()
+        if event:
+            event.Skip()
         
     def UpdateSettings(self):
         """Update UserSettings"""