fix(mail(js)): show "Download all attachments" menu option

UI/WebServerResources/js/Mailer/Message.service.js

@@ -556,6 +556,22 @@
     return Message.$$resource.post(this.$absolutePath(), 'sendMDN');
   };
 
+  /**
+   * @function hasAttachments
+   * @memberof Message.prototype
+   * @returns true if there's one ore more attached files
+   */
+  Message.prototype.hasAttachments = function(content) {
+    var _this = this;
+
+    return !!_.find(content || this.parts.content, function(part) {
+      if (angular.isArray(part.content)) {
+        return _this.hasAttachments(part.content);
+      }
+      return part.type == 'UIxMailPartLinkViewer' || part.type == 'UIxMailPartImageViewer';
+    });
+  };
+
   /**
    * @function $deleteAttachment
    * @memberof Message.prototype