empty keyword in Struts

Is there an empty keyword in Struts 2 (like in JSP)?

For example in JSP I write:

<c:if test="${empty var}">

Thanks开发者_JAVA技巧

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Just test for null.

And to acheive the same effect than the JSTL empty keyword with strings (which means "null or empty"), you need two checks (yes it is tiresome):

<s:if test="foo != null && foo != ''">