$displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
if ( $displayTitle === false ) {
$displayTitle = $contextTitle->getPrefixedText();
$displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
if ( $displayTitle === false ) {
$displayTitle = $contextTitle->getPrefixedText();