Media JS: Ensure the subtype key has a default set.

Prevents undefined JS errors in the attachments view template.

see #21390.


git-svn-id: http://core.svn.wordpress.org/trunk@22160 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-views.js

@@ -409,7 +409,8 @@
 				options = _.defaults( this.model.toJSON(), {
 					orientation: 'landscape',
 					uploading:   false,
-					type:        ''
+					type:        '',
+					subtype:     ''
 				});
 
 			options.buttons = this.buttons;

wp-includes/media.php

@@ -1340,8 +1340,6 @@ function wp_print_media_templates( $attachment ) {
 				<div class="filename"><%- filename %></div>
 			<% } %>
 
-
-
 			<% if ( buttons.close ) { %>
 				<a class="close" href="#">&times;</a>
 			<% } %>