Pull request #3002: KERNEL-9408 fix:解决button的icon属性有时失效

Merge in VISUAL/fineui from ~TREECAT/fineui:master to master

* commit 'cf819306fd173e55d4713b71d6ab8ef384160910':
  KERNEL-9408 fix:解决button的icon属性有时失效

src/base/single/button/buttons/button.js

@@ -90,7 +90,7 @@
                 }
             }
 
-            var iconInvisible = !o.loading && !o.iconCls;
+            var iconInvisible = !o.loading && !o.iconCls && !o.icon;
             if (BI.isPlainObject(o.icon) && !o.loading) {
                 this.icon = BI.createWidget(o.icon);
             } else {