Account for `getKeyTableEntry` sometimes returning an invalid response

[puddly]

Related: https://github.com/home-assistant/core/issues/117859

It looks like the getKeyTableEntry response is sometimes much shorter than expected!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.72%. Comparing base (eae32ea) to head (02edef8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #625 +/- ## ======================================= Coverage 99.71% 99.72% ======================================= Files 75 75 Lines 4996 5002 +6 ======================================= + Hits 4982 4988 +6 Misses 14 14 ```

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