Merge pull request #82 from tecknicaltom/relview_None_handle

Fix for a None handle lookup in relview

gramps/plugins/view/relview.py

@@ -497,6 +497,8 @@ class RelationshipView(NavigationView):
         for old_child in self.header.get_children():
             self.header.remove(old_child)
 
+        person = None
+        if obj:
             person = self.dbstate.db.get_person_from_handle(obj)
         if not person:
             self.family_action.set_sensitive(False)