Fixed bug showing profile fetchrate while foodsaver has zero pickups

What does this MR do?

Remove fetchrate for users with zero pickups

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

Very!

Links to related issues

none?

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))