[pitivi] Prevent starting PiTiVi with an invalid project file argument

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

commit 9626708b0b38adeeddcc93166cd4ffc0536a58db
Author: Jean-FranÃois Fortin Tam <nekohayo gmail com>
Date:   Thu Jul 12 23:34:59 2012 -0400

    Prevent starting PiTiVi with an invalid project file argument
    
    Fixes bug #679711

 pitivi/application.py |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/application.py b/pitivi/application.py
index bd343a2..46b88be 100644
--- a/pitivi/application.py
+++ b/pitivi/application.py
@@ -399,7 +399,11 @@ class ProjectLoaderGuiPitivi(FullGuiPitivi):
 
     def __init__(self, project_filename, debug=False):
         FullGuiPitivi.__init__(self, debug)
-        self._loadProject(project_filename)
+        if not os.path.exists(project_filename):
+            self.error("Project file does not exist: %s" % project_filename)
+            sys.exit(1)
+        else:
+            self._loadProject(project_filename)
 
 
 class StartupWizardGuiPitivi(FullGuiPitivi):