quiz allows to delete the last question in a section

The "select multiple items" button allows deleting the last question in a section.

Steps to reproduce:

1. Create a quiz
2. Add 3 questions to the quiz
3. Create a new section heading between question 1 and question 2. So question 2 and question 3 will be in the newly created section
4. Click on the "Select multiple items" button
5. Select 1uestion 2 and question 3, and then click on the "Delete selected" button.
6. You see the questions are deleted from the quiz and you are ended up with an empty section heading!