NPE in GetAsStringTag when using ignore flag
--------------------------------------------

                 Key: TILES-305
                 URL: https://issues.apache.org/struts/browse/TILES-305
             Project: Tiles
          Issue Type: Bug
          Components: tiles-jsp (jsp support)
    Affects Versions: 2.1.0
            Reporter: Oleg Gorobets


Current implementation of GetAsStringTag throws NPE if there is no such 
attribute and ignore flag is set to true. GetAsStringTag implies not-null 
attribute while InsertAttributeTag from which it is derived misses check of  
ignore flag before rendering. Need to add simple check in 
InsertAttributeTag.render() like it was in tiles-2.0.5:
if (attr == null && ignore) {
      return;
}


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