[pitivi] project: Remove double check of correct values

[Alexandru Băluț <alexbalut src gnome org>]

commit 46dbd60bc56e7fc8a219ba2b5a88abf2420e757c
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue May 31 17:36:00 2016 +0200

    project: Remove double check of correct values
    
    The setVideoRestriction and __setAudioRestriction methods already check
    that 'value' is ok.
    
    Differential Revision: https://phabricator.freedesktop.org/D1040

 pitivi/project.py |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/pitivi/project.py b/pitivi/project.py
index 118404c..a1eb373 100644
--- a/pitivi/project.py
+++ b/pitivi/project.py
@@ -818,7 +818,7 @@ class Project(Loggable, GES.Project):
 
     @videowidth.setter
     def videowidth(self, value):
-        if value and self.setVideoRestriction("width", int(value)):
+        if self.setVideoRestriction("width", int(value)):
             self._emitChange("rendering-settings-changed", "width", value)
 
     @property
@@ -827,7 +827,7 @@ class Project(Loggable, GES.Project):
 
     @videoheight.setter
     def videoheight(self, value):
-        if value and self.setVideoRestriction("height", int(value)):
+        if self.setVideoRestriction("height", int(value)):
             self._emitChange("rendering-settings-changed", "height", value)
 
     @property
@@ -855,7 +855,7 @@ class Project(Loggable, GES.Project):
 
     @audiochannels.setter
     def audiochannels(self, value):
-        if value and self.__setAudioRestriction("channels", int(value)):
+        if self.__setAudioRestriction("channels", int(value)):
             self._emitChange("rendering-settings-changed", "channels", value)
 
     @property
@@ -867,7 +867,7 @@ class Project(Loggable, GES.Project):
 
     @audiorate.setter
     def audiorate(self, value):
-        if value and self.__setAudioRestriction("rate", int(value)):
+        if self.__setAudioRestriction("rate", int(value)):
             self._emitChange("rendering-settings-changed", "rate", value)
 
     @property