Fix: page issue icon type determination

The page issuer parser works with plain old Elements, not jQuery. Pass
in the expected type.

This addresses problems with the icon display for ambox templates relating
to balance (see https://phabricator.wikimedia.org/T191528#4465069)

Bug: T191528
Change-Id: Ie4a34087f9f1700342cc54a50cd3272fc9ea34ee

resources/skins.minerva.scripts/cleanuptemplates.js

@@ -119,13 +119,13 @@
 		// store it for late
 		allIssues[section] = issues;
 
-		if ( inline ) {
+		if ( $metadata.length && inline ) {
 			severity = pageIssueParser.maxSeverity(
 				issues.map( function ( issue ) { return issue.pageIssue; } )
 			);
 			new Icon( {
 				glyphPrefix: 'minerva',
-				name: pageIssueParser.iconName( $metadata, severity )
+				name: pageIssueParser.iconName( $metadata.get( 0 ), severity )
 			} ).prependTo( $metadata.find( '.mbox-text' ) );
 			$learnMore = $( '<span>' )
 				.addClass( 'ambox-learn-more' )