[pitivi/ges] Prevent calculating setBestZoomRatio with empty timelines

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

commit 7f5b35f03d83ac482e828b3628648d7ea70632de
Author: Jean-FranÃois Fortin Tam <nekohayo gmail com>
Date:   Thu Apr 26 19:56:59 2012 -0400

    Prevent calculating setBestZoomRatio with empty timelines

 pitivi/mainwindow.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/mainwindow.py b/pitivi/mainwindow.py
index 05c924e..135449c 100644
--- a/pitivi/mainwindow.py
+++ b/pitivi/mainwindow.py
@@ -767,6 +767,9 @@ class PitiviMainWindow(gtk.Window, Loggable):
         # Add gst.SECOND - 1 to the timeline duration to make sure the
         # last second of the timeline will be in view.
         duration = self.app.current.timeline.props.duration
+        if duration == 0:
+            self.debug("The timeline duration is 0, impossible to calculate zoom")
+            return
         timeline_duration = duration + gst.SECOND - 1
         timeline_duration_s = int(timeline_duration / gst.SECOND)