The Texture Manager will now fail gracefully when a texture isn't cre…

…ated as a result of calling the `addBase64` method. Rather than the error "TypeError: null is not an object (evaluating 'texture.source')" is will not return early

src/textures/TextureManager.js

@@ -366,6 +366,11 @@ var TextureManager = new Class({
             {
                 var texture = _this.create(key, image);
 
+                if (!texture)
+                {
+                    return;
+                }
+
                 Parser.Image(texture, 0);
 
                 _this.emit(Events.ADD, key, texture);