修改极光推送插件registerForPushWithJpush不传别名参数时会误传一个"null"别名到客户端的问题

show-server/src/main/webapp/ipu/frame/mobile/expand-mobile.js

@@ -277,7 +277,11 @@ define(["require","jcl"],function(require,Wade) {
			},setCallbackForPushWithYunba:function(callback){
				execute("setCallbackForPushWithYunba", [callback]);
			},registerForPushWithJpush:function(account, err){
				execute("registerForPushWithJpush", [account], err);
				if(account==undefined){
					execute("registerForPushWithJpush", [], err);
				} else {
					execute("registerForPushWithJpush", [account], err);
				}
			},unregisterForPushWithJpush:function(){
				execute("unregisterForPushWithJpush", []);
			},setJpushAlias:function(alias, err){