empty tag - If the requested variable is either null or an empty string then we use this tag to evaluate the contents contained in the nested body parts of this tag.
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empty tag - If the requested variable is either null or an empty string then we use this tag to evaluate the contents contained in the nested body parts of this tag.
Tag evaluation of the nested body content occurs only if the specified value is either absent (i.e. null), an empty string (i.e. a java.lang.String with a length of zero), or an empty java.util.Collection or java.util.Map (tested by the isEmpty() method on the respective interface).
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