Protect views with no histories

svn: r15301
2010-05-02 13:48:49 +00:00
parent 6bfe45f079
commit 4a8414e5c8
1 changed files with 3 additions and 2 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):
        """
@ -421,6 +421,7 @@ class DisplayState(gen.utils.Callback):
        the given handle.
        """
        history = self.get_history(nav_type, nav_group)
+        if history:
            history.push(handle)

    def set_sensitive(self, state):