Merge pull request #223 in ~GUY/fineui from ~YOUNG/fineuig:master to master

* commit '13eda7a08ceef0f612a8a2f6a8144267abfc49fd':
  vm不一定是一个VM对象也不一定有_watchers

dist/fix/fix.js

@@ -48,7 +48,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
     }
 
     function remove(arr, item) {
-        if (arr.length) {
+        if (arr && arr.length) {
             var _index = arr.indexOf(item);
             if (_index > -1) {
                 return arr.splice(_index, 1);