Pull request #1604: 无JIRA任务 后台回传数据可能真会存在叫render的属性名

Merge in VISUAL/fineui from ~TELLER/fineui:bugfix to master

* commit 'fdd7a860dea1a787ff43833edff4acbadee90f0e':
  fix: 可能真会存在叫render的属性名

src/core/widget.js

@@ -185,7 +185,7 @@
 
         _initElement: function () {
             var self = this;
-            var render = this.options.render || this.render;
+            var render = BI.isFunction(this.options.render) ? this.options.render : this.render;
             var els = render && render.call(this);
             if (BI.isPlainObject(els)) {
                 els = [els];