Hide plugins tab when no visible plugins (e.g., editor has only editing plugins but is opened in viewer mode)

apps/common/main/lib/collection/Plugins.js

@@ -49,6 +49,10 @@ define([
     'use strict';
 
     Common.Collections.Plugins = Backbone.Collection.extend({
-        model: Common.Models.Plugin
+        model: Common.Models.Plugin,
+
+        hasVisible: function() {
+            return !!this.findWhere({visible: true});
+        }
     });
 });

apps/common/main/lib/controller/Plugins.js

@@ -174,7 +174,7 @@ define([
                 arr.push(plugin);
             });
             this.api.asc_pluginsRegister('', arr);
-            if (storePlugins.length>0)
+            if (storePlugins.hasVisible())
                 Common.NotificationCenter.trigger('tab:visible', 'plugins', true);
         },