HTTP codes in get_pad_session API call

public/js/vroom.js

@@ -1487,18 +1487,19 @@ function initVroom(room) {
           })
         },
         error: function(data) {
-          $.notify(locale.ERROR_OCCURRED, 'error');
+          data = data.responseJSON;
+          if (data.msg){
+            $.notify(data.msg, 'error');
+          }
+          else{
+            $.notify(locale.ERROR_OCCURRED, 'error');
+          }
         },
         success: function(data) {
-          if (data.status == 'success'){
-            if (data.msg){
-              $.notify(data.msg, 'success');
-            }
-            loadEtherpadIframe();
-          }
-          else if (data.msg){
-            $.notify(data.msg, 'error');
+          if (data.msg){
+            $.notify(data.msg, 'success');
           }
+          loadEtherpadIframe();
         }
       });
     }

vroom.pl

@@ -1803,8 +1803,10 @@ any '/api' => sub {
     return $self->render(
       json => {
         msg    => $self->l('ERROR_OCCURRED'),
+        err    => 'ERROR_OCCURRED',
         status => 'error'
-      }
+      },
+      styaus => 503
     );
   }
   # Delete a room