Remove snackbar on cafeteria comments
When you try to submit an empty quesion or answer, the form field won't let you do it and provide an appropriate error message. When you try to submit an empty cafeteria comment, you get a snackbar with "A comment must consist of min. 12 chars" in addition to the form field message. I think we should remove the snackbar to make the UX more consistent throughout the app.