给select下拉框赋值option，会多出一个空的option标签
BUG：
art-template 版本：art-template@4.11.0
环境版本（google浏览器）

代码：
```
<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<select id="catalogContainer"></select>
<!-- lib -->
<script type="text/javascript" src="lib/jquery.validation/1.14.0/jquery.validate.js"></script> 
<script type="text/javascript" src="lib/artTemplate/template-web.js"></script>

<script id="catalogSelect" type="text/html">
    {{each list as value i}}
    	<option value={{value.id}}>{{value.name}}<option>
    {{/each}}
</script>

<!-- my -->
<script type="text/javascript">
	var data = {
		list : [
			{
				id: 1,
				name: "test1"
			},
			{
				id: 2,
				name: "test2"
			}
		]	
	}
    var html = template('catalogSelect', data);
    document.getElementById('catalogContainer').innerHTML = html;
</script>
</body>
</html>
```

运行结果：

多出来N个空的option标记