Show placeholder if there are no messages in folder
- Dominant language
- Vala
- Stars
- 215
- Forks
- 50
- Avg merge
- 3h 11m
- Merged PRs (30d)
- 1
Description
## Problem
Right now there is no placeholder image or indication that a folder contains no messages:

## Proposal
We should display some sort of placeholder, so the user does not think this is due to an error. In case we are dealing with the inbox folder it would be even nicer to show some rewarding thing which celebrates the fact that there is "nothing to do".
## Prior Art
Seen this "Yay, you're all done :partying_face:" in quite a lot of different places. Despite, I'm still a little proud of myself every time I get to see this :) Here's just one example of what GitHub does:

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Assessment
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