[Queue-2.0] Bug: Feedback page does not load Overview

Summary

The overview of feedback does not get displayed currently.

Steps to reproduce

1. Go to the /feedback page
2. Notice there is no overview

Possible Fix

Change the thymeleaf template to be able to handle NULLs in the feedback field (often it is just an empty string with new queue, we didn't notice it in development because of this).

Logs

ProcessingException: Exception evaluating SpringEL expression: "!fb.feedback.isEmpty()" (template: "home/feedback" - line 57, col 29)] with root cause org.springframework.expression.spel.SpelEvaluationException: EL1011E: Method call: Attempted to call method isEmpty() on null context object