List style parameter "none" is ignored in TOC Zone macro

After insert a new TOC Zone macro, the list style parameter "none" is ignored.

Steps to reproduce :

• Insert TOC zone macro to a page
• Select "Output type" list and "List style" as None.
• Check the preview - You will notice headings displayed in bullet points.
  This is not expected behavior as you selected List style as None.

According to the documentation https://confluence.atlassian.com/display/DOC/Table+of+Content+Zone+Macro

none — no list style is displayed

This is confusing for the users.