HTML validator errors on the feedback analysis page

1. Log in as a teacher/admin
2. Create a feedback activity
3. Add different question types to the feedback
4. On another browser session, log in as a student and answer the feedback
5. On the admin/teacher's browser page, go to the Analysis page.
6. View the page source, copy it and check it using Nu HTML Validator.

Errors

1. The "align" attribute on the "th" element is obsolete.
2. Table column 2 established by element "th" has no cells beginning in it.
   • th elements with colspan=2 are causing this
3. Stray "tr/td" elements related to the Average value for multichoice rated question type.
   • Only seen on raw page source. The problem seems to be fixed automatically by the browsers.