 custom
 action element is empty or not in the JSP page, not on how it's declared in the TLD.

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 If SKIP_BODY is returned the body is not evaluated, and then doEndTag() is invoked.

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 If EVAL_BODY_INCLUDE is returned, and the custom action element is not empty, the body is evaluated and "passed
 through" to the current out, then doAfterBody() is invoked and, after zero or more iterations, doEndTag() is invoked.</div>
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