[pitivi] timeline/track.py: disable audio transitions for now

[Edward Hervey <edwardrv src gnome org>]

commit 5be0fb833e20f9587281002179fcf5357d921c3a
Author: Brandon Lewis <brandon_lewis alum berkeley edu>
Date:   Mon Mar 8 15:47:47 2010 -0800

    timeline/track.py: disable audio transitions for now

 pitivi/timeline/track.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index 5121bb9..fa4a5d7 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -1033,6 +1033,8 @@ class Track(Signallable, Loggable):
         self.composition.props.update = False
 
     def addTransition(self, transition):
+        if type(self.stream) is AudioStream:
+            return
         a, b = transition.a, transition.b
         if not ((a in self.track_objects) and
                 (b in self.track_objects)):