fix multi-image.js when quick-reply isn`t loaded

js/multi-image.js

@@ -21,7 +21,9 @@ function multi_image() {
             var new_file = '<br class="file_separator"/><input type="file" name="file'+(images_len+1)+'" id="upload_file'+(images_len+1)+'">';
 
             $('[type=file]:last').after(new_file);
-            $('form:not([id="quick-reply"]) [type=file]:last').after(new_file);
+            if ($("#quick-reply").length) {
+                $('form:not(#quick-reply) [type=file]:last').after(new_file);
+            }
             if (typeof setup_form !== 'undefined') setup_form($('form[name="post"]'));
         }
     })