Creating a folder name with a dot in the name will create a FileManagerEntry with extension

[veselints]

Bug report

Creating a folder name with a dot(.) in the name will create a FileManagerEntry with extension. The issue should be hidden in the content provider/service that are used on our demos: https://demos.telerik.com/kendo-ui/filemanager/index

Reproduction of the problem

• Run the Index demo: https://demos.telerik.com/kendo-ui/filemanager/index
• Create a folder with the following name: test2.0
• The folder will be rendered with name test2.0.0 (name + extension)
• If you refresh the page, you will notice that the service Read will return an entity with the following fields:

  name: "test2.0"
  path: "test2.0"
  extension: ".0"

  Note the extension which should not be present for folders.

Expected/desired behavior

The content provider/service should not assign extension on Folder entities, even is their name contains a dot(.).

Environment

• Kendo UI version: 2020.1.114
• Browser: [all]

[nenchef]

Reported in ticketID: 1469144