Fix Geography view 'Find' when db is closed.

Fixes #10229

gramps/plugins/view/geoevents.py

@@ -187,6 +187,8 @@ class GeoEvents(GeoGraphyView):
         all handling of visibility is now in rebuild_trees, see that for more
         information.
         """
+        if not self.dbstate.is_open():
+            return
         active = self.uistate.get_active('Event')
         if active:
             self._createmap(active)