Allow STATUS response to contain an empty list

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (dfabbf9) 78.83% compared to head (bb1b5ac) 78.85%.

Files	Patch %	Lines
imap-proto/src/parser/tests.rs	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #154 +/- ## ========================================== + Coverage 78.83% 78.85% +0.01% ========================================== Files 22 22 Lines 3652 3660 +8 ========================================== + Hits 2879 2886 +7 - Misses 773 774 +1 ```

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