Media JS: Only block button events by default if the button does not link to anything. see #21390.

git-svn-id: http://core.svn.wordpress.org/trunk@22501 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-views.js

@@ -1625,7 +1625,9 @@
 		},
 
 		click: function( event ) {
+			if ( '#' === this.attributes.href )
 				event.preventDefault();
+
 			if ( this.options.click && ! this.model.get('disabled') )
 				this.options.click.apply( this, arguments );
 		}