[pitivi] Don't try to add Effects as Track Elements.

[Jean-François Fortin Tam <jfft src gnome org>]

commit c8bca5db2b3f13e416f5d407abbdd438dea100e6
Author: Mathieu Duponchelle <mathieu duponchelle epitech eu>
Date:   Mon Apr 22 00:28:40 2013 +0200

    Don't try to add Effects as Track Elements.

 pitivi/timeline/timeline.py |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 3ad8985..e89fd8a 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -35,7 +35,7 @@ from pitivi.utils.widgets import ZoomBox
 
 from ruler import ScaleRuler
 from gettext import gettext as _
-from pitivi.utils.pipeline import Pipeline
+from pitivi.utils.pipeline import Pipeline, PipelineError
 from elements import URISourceElement, TransitionElement, Ghostclip
 from controls import ControlContainer
 
@@ -334,6 +334,8 @@ class TimelineStage(Clutter.ScrollActor, Zoomable):
         self.add_child(self._snap_indicator)
 
     def _addTimelineElement(self, track, bElement):
+        if isinstance(bElement, GES.Effect):
+            return
         if isinstance(bElement.get_parent(), GES.TransitionClip):
             element = TransitionElement(bElement, track, self)
             element.set_z_position(0)