2.5 External animation player:

* Fixed an error when "Custom" was used and the path was empty (variable reference before assignment)
* The Operator now raises an error if there is no path or the path given is not available.

release/scripts/startup/bl_operators/screen_play_rendered_anim.py

@@ -60,6 +60,9 @@ def guess_player_path(preset):
     elif preset == 'MPLAYER':
         player_path = "mplayer"
     
+    else:
+        player_path = ""
+
     return player_path
 
 
@@ -132,11 +135,13 @@ class PlayRenderedAnim(bpy.types.Operator):
         else:  # 'CUSTOM'
             cmd.append(file)
             
+        if (player_path == "") or (os.path.exists(player_path)==False):
+            self.report({'ERROR'}, "Couldn't find an external animation player")
+        else:
             # launch it
             try:
                 process = subprocess.Popen(cmd)
             except:
                 pass
-            #raise OSError("Couldn't find an external animation player.")
 
         return {'FINISHED'}