[pitivi] project: Fix setting of restriction caps values

[Thibault Saunier <tsaunier src gnome org>]

commit 9e39466d93e6693edbb25fcf917a8e29d84712f3
Author: Thibault Saunier <tsaunier gnome org>
Date:   Wed Sep 24 16:11:51 2014 +0200

    project: Fix setting of restriction caps values

 pitivi/project.py |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/pitivi/project.py b/pitivi/project.py
index 46d70e7..c554927 100644
--- a/pitivi/project.py
+++ b/pitivi/project.py
@@ -709,9 +709,10 @@ class Project(Loggable, GES.Project):
     def set_video_restriction_value(self, name, value):
         if self.video_profile.get_restriction()[0][name] != value and value:
             restriction = self.video_profile.get_restriction().copy_nth(0)
-            restriction[0][name] = value
+            restriction.set_value(name, value)
             self.video_profile.set_restriction(restriction)
             return True
+
         return False
 
     def set_audio_restriction_value(self, name, value):
@@ -1086,13 +1087,13 @@ class Project(Loggable, GES.Project):
             self.timeline.append_layer()
 
     def _ensureVideoRestrictions(self):
-        if not self.videowidth:
+        if self.videowidth is None:
             self.videowidth = 720
-        if not self.videoheight:
+        if self.videoheight is None:
             self.videoheight = 576
-        if not self.videorate:
+        if self.videorate is None:
             self.videorate = Gst.Fraction(25, 1)
-        if not self.videopar:
+        if self.videopar is None:
             self.videopar = Gst.Fraction(1, 1)
 
     def _ensureAudioRestrictions(self):