get_active should return None if no history object exists

svn: r15037
2010-04-05 16:14:26 +00:00 · 2010-04-05 16:14:26 +00:00 · ffffb7047c
commit ffffb7047c
parent 844002e312
1 changed files with 1 additions and 1 deletions
--- a/src/DisplayState.py
+++ b/src/DisplayState.py
@ -413,7 +413,7 @@ class DisplayState(gen.utils.Callback):
        navigation type and group.
        """
        history = self.get_history(nav_type, nav_group)
-        return history.present()
+        return history.present() if history else None

    def set_active(self, handle, nav_type, nav_group=0):
        """