Fix data type of an empty list

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (9556687) to head (e4573fb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #257 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 12 12 Lines 2097 2097 ========================================= Hits 2097 2097 ```

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