Changed the fx.stop() function to only apply the stop if there seems …

…to be an animation in progress and to reset the cached animation info to empty.

src/fx.js

@@ -35,7 +35,10 @@
   };
 
   $.fn.stop = function(){
-    this.one(cachedAnimation.endEvent, cachedAnimation.callback);
+    if(cachedAnimation.callback && cachedAnimation.endEvent){
+      this.one(cachedAnimation.endEvent, cachedAnimation.callback);
+    }
+    cachedAnimation = {};
   }
 
   $.fn.anim = function(properties, duration, ease, callback){