Less branching, no empty returns

SpecialMobileCitations.php

<?php
/**
 * SpecialMobileCite.php
 */

/**
 * Provides a list of citiations available for a page
 */
class SpecialMobileCite extends MobileSpecialPage {
	
	// ...

	/**
	 * Render the page with a list of references for the given revision identifier
	 * @param string $pagename The revision number
	 */
	public function executeWhenAvailable( $param ) {
		$out = $this->getOutput();

		$revision = null;
		if ( $param ) {
			$args = explode( '/', $param );
			if ( ctype_digit( $args[0] ) ) {
				$revId = intval( $args[0] );
				$revision = Revision::newFromId( $revId );
			}
		}

		if ( $revision ) {
			$title = $revision->getTitle();
			$html = $this->getReferenceBodyHtml( $title, $revId );
			$html = MobileUI::contentElement( $html );
			$out->setPageTitle( $title->getText() );
			$out->addHTML( $html );
		} else {
			$out->setPageTitle( $this->msg( 'mobile-frontend-cite-error-title' ) );
			$out->addHTML( MobileUI::errorBox( $this->msg( 'mobile-frontend-cite-error' ) ) );
		}
	}
}