Add check for empty query_output

[pogzyb]

This PR adds an additional check to query_output to ensure that empty responses are not passed to the parser resulting in parser_output containing only None values.

[codecov[bot]]

Codecov Report

Patch coverage: 16.66% and project coverage change: -0.13 :warning:

Comparison is base (ab1fb1f) 88.88% compared to head (a1803a8) 88.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #58 +/- ## ========================================== - Coverage 88.88% 88.75% -0.13% ========================================== Files 8 8 Lines 2815 2819 +4 ========================================== Hits 2502 2502 - Misses 313 317 +4 ``` | [Impacted Files](https://app.codecov.io/gh/pogzyb/asyncwhois/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joe) | Coverage Δ | | |---|---|---| | [asyncwhois/query.py](https://app.codecov.io/gh/pogzyb/asyncwhois/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joe#diff-YXN5bmN3aG9pcy9xdWVyeS5weQ==) | `78.43% <16.66%> (-2.11%)` | :arrow_down: |

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