[JSTL] list empty/null/size 체크

컨트롤러에서 넘어온 List가 비어있는지 확인

<c:if test="${testList.size() != 0 }">
	testList.size() !=0 
</c:if>
<c:if test="${not empty testList  }">
	testList not empty
</c:if>
<c:if test="${fn:length(testList) > 0 }">
	fn:length(testList)>0
</c:if>