Notifications do not disappear after autorefresh

This is not affected anymore because the errors goes directly
into the container. But this commit fixes the codes if someone
use the notifications in the loader. Also remove unused
variable this.exception.

fixes #6278

public/js/icinga/loader.js

@@ -24,8 +24,6 @@
 
         this.failureNotice = null;
 
-        this.exception = null;
-
         /**
          * Pending requests
          */
@@ -313,13 +311,10 @@
         onResponse: function (data, textStatus, req) {
             var self = this;
             if (this.failureNotice !== null) {
+                if (! this.failureNotice.hasClass('fading-out')) {
                     this.failureNotice.remove();
-                this.failureNotice = null;
                 }
-
-            if (this.exception !== null) {
-                this.exception.remove();
-                this.exception = null;
+                this.failureNotice = null;
             }
 
             // Remove 'impact' class if there was such
@@ -646,7 +641,13 @@
             var $notice = $(
                 '<li class="' + c + '">' + message + '</li>'
             ).appendTo($('#notifications'));
+
             this.icinga.ui.fixControls();
+
+            if (!persist) {
+                this.icinga.ui.fadeNotificationsAway();
+            }
+
             return $notice;
         },