Ticket #16503: 16503.2.diff

wp-includes/post.php

@@ -487 +487 @@
 function get_post_format( $post = null ) {
         $post = get_post($post);
 
+        if ( ! post_type_supports( $post->post_type, 'post-formats' ) )
+                return false;
+
         $_format = get_the_terms( $post->ID, 'post_format' );
 
         if ( empty( $_format ) )