[pitivi] ui/timeline.py: Adding an effect to the timeline does nothing

[Edward Hervey <edwardrv src gnome org>]

commit 9aa0287aaf4fc8876722ea56c0563e6d754788b4
Author: Thibault Saunier <tsaunier gnome org>
Date:   Wed Sep 1 15:20:21 2010 +0200

    ui/timeline.py: Adding an effect to the timeline does nothing

 pitivi/ui/timeline.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/ui/timeline.py b/pitivi/ui/timeline.py
index 3980d01..8b37854 100644
--- a/pitivi/ui/timeline.py
+++ b/pitivi/ui/timeline.py
@@ -464,7 +464,8 @@ class Timeline(gtk.Table, Loggable, Zoomable):
 
             return True
         elif context.targets in DND_EFFECT_LIST:
-
+            if not self.timeline.timeline_objects:
+                return False
             factory = self._factories[0]
             timeline_objs = self._getTimelineObjectUnderMouse(x, y, factory.getInputStreams()[0])
             if timeline_objs:
@@ -502,6 +503,8 @@ class Timeline(gtk.Table, Loggable, Zoomable):
             uris = selection.data.split("\n")
             self._factories = [self.project.sources.getUri(uri) for uri in uris]
         else:
+            if not self.timeline.timeline_objects:
+                return False
             self._factories = [self.app.effects.getFactoryFromName(selection.data)]
 
         context.drag_status(gtk.gdk.ACTION_COPY, timestamp)