SAX: Always initialize SAX1 element handlers Follow-up to commit d0c3f01e. A parser context will be initialized to SAX version 2, but this can be overridden with XML_PARSE_SAX1 later, so we must initialize the SAX1 element handlers as well. Change the check in xmlDetectSAX2 to only look for XML_SAX2_MAGIC, so we don't switch to SAX1 if the SAX2 element handlers are NULL.