Slightly improved detection of "empty" in placeholder replacement when

using the {foo__bar||default} syntax, so it works for things like
dropdowns.  Would be nice to call the element's dataConsideredEmpty()
method, but that would be a huge overhead.

components/com_fabrik/helpers/parent.php

@@ -948,10 +948,8 @@ protected function replaceWithFormData($matches)
 		{
 			$match = self::parseMessageForPlaceHolder('{' . $bits[0] . '}', $this->_searchData, false);
 
-			if ($match == '')
+			if (in_array($match, array('', '<ul></ul>', '<ul><li></li></ul>')))
 			{
-				// 	$$$ rob seems like bits[1] in fabrik plugin is already matched so return that rather then reparsing
-				// $match = self::parseMessageForPlaceHolder("{".$bits[1]."}", $this->_searchData);
 				return $bits[1] !== '' ? $bits[1] : $orig;
 			}
 			else