[bugfix] fn:parse-xml-fragment('') should return an empty document

Author: adamretter

exist-core/src/main/java/org/exist/xquery/functions/fn/ParsingFunctions.java

@@ -103,10 +103,6 @@ public Sequence eval(final Sequence[] args, final Sequence contextSequence) thro
 			return Sequence.EMPTY_SEQUENCE;
 		}
 		final String xmlContent = args[0].itemAt(0).getStringValue();
-		if (xmlContent.isEmpty()) {
-			return Sequence.EMPTY_SEQUENCE;
-		}
-        
         return parse(xmlContent, args);
 	}