<c:if test="${name.na=='null'}"> </c:if>解决办法

<c:if test="${name.na=='null'}"> </c:if>
<ec:column property="mobilephone" title="手机号码" sortable="false">
<c:if test="${balance.mobilephone=='null'}">
则为空
</c:if>
</ec:column>
则为空怎么写呀？？
------解决方案--------------------
不用写就这样

<c:if test="${balance.mobilephone=='null'}">

</c:if>
或者
<c:if test="${balance.mobilephone=='null'}">
&nbsp;
</c:if>