Version 2.8.16

functional improvement

Manage contents
1. Fixed a bug in the bug-eating note creation form that caused the pagination to be displayed as 1/0 in some materials when the content was saved without writing and then re-edited.
2. In the quiz/test creation form, when the preview of the question is opened after placing a section and "Close without saving" is clicked, the section that had been placed was disappearing.