[cheese] Do not crash if gnome-video-effects is not present

[David King <davidk src gnome org>]

commit 554e81eb22467b5f2a2f8aa649850b443ffd2d0b
Author: David King <amigadave amigadave com>
Date:   Tue Oct 4 11:51:32 2011 +0200

    Do not crash if gnome-video-effects is not present
    
    Also, print a warning using warning(). Fixes bug 654671.

 src/cheese-window.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/cheese-window.vala b/src/cheese-window.vala
index 5824d30..d0c8bb5 100644
--- a/src/cheese-window.vala
+++ b/src/cheese-window.vala
@@ -955,11 +955,14 @@ public class Cheese.MainWindow : Gtk.Window
       effects_manager = new EffectsManager ();
       effects_manager.load_effects ();
 
+      /* Must initialize effects_grids before returning, as it is dereferenced later, bug 654671. */
+      effects_grids = new ArrayList<Clutter.Box> ();
+
       if (effects_manager.effects.size == 0)
       {
+        warning ("gnome-video-effects is not installed.");
         return;
       }
-      effects_grids = new ArrayList<Clutter.Box> ();
 
       for (int i = 0; i <= effects_manager.effects.size / EFFECTS_PER_PAGE; i++)
       {