Resolve "ErrorException: Undefined index: foodsaver_sleeping_hat"

Closes #243 (closed)

What does this MR do?

Fixes that sleeping hat duration is shown on the profile page

How confident are you it won't break things if deployed?

very

Links to related issues

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))