(feat) now supports RFC6154 and NoInferiors IMAP flag

UI/Templates/MailerUI/UIxMailMainFrame.wox

@@ -120,7 +120,7 @@
                         <var:string label:value="Mark Folder Read"/>
                       </md-button>
                     </md-menu-item>
-                    <md-menu-item>
+                    <md-menu-item ng-hide="folder.$isNoInferiors">
                       <md-button type="button" ng-click="app.newFolder(folder)">
                         <var:string label:value="New Subfolder..."/>
                       </md-button>

UI/WebServerResources/js/Mailer/Mailbox.service.js

@@ -165,6 +165,7 @@
     if (this.type) {
       this.$isEditable = this.isEditable();
     }
+    this.$isNoInferiors = this.isNoInferiors();
     if (angular.isUndefined(this.$shadowData)) {
       // Make a copy of the data for an eventual reset
       this.$shadowData = this.$omit();
@@ -375,6 +376,16 @@
     return this.type == 'folder';
   };
 
+  /**
+   * @function isNoInferiors
+   * @memberof Mailbox.prototype
+   * @desc Checks if the mailbox can contain submailboxes
+   * @returns true if the mailbox can not contain submailboxes
+   */
+  Mailbox.prototype.isNoInferiors = function() {
+    return this.flags.indexOf('noinferiors') >= 0;
+  };
+
   /**
    * @function $rename
    * @memberof AddressBook.prototype
@@ -721,7 +732,7 @@
       Mailbox.$timeout(function() {
         var uids, headers;
 
-        if (_this.$topIndex > data.uids.length - 1)
+        if (!data.uids || _this.$topIndex > data.uids.length - 1)
           _this.$topIndex = 0;
 
         _this.init(data);