How do I test an attribute inside a c:forEach element?

Hello,

My situation is as follows. I am using the core JSTL, specifically the c:forEach instruction. Due to some logic I've developed, this forEach could receive two different Lists (passed by the request object), but one of them is null. I need to test which one of the Lists comes with stuff. For simplicity, let's assume both lists have the same elements so the main issue won't be the forEach's body.  

The code I tried to develop was similar to the one I'm attaching, but it won't seem to work.

Any help on this issue is appreciated.

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1:

<c:forEach items="<c:choose><c:when test='${list1 != null}'>${list1}</c:when><c:otherwise>${list2}</c:otherwise></c:choose>" var="element" varStatus="elementStatus">