Fixing bug in .parse

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.56%. Comparing base (d4f75bd) to head (21b943b).

Files	Patch %	Lines
openparticle/src.py	75.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #36 +/- ## ========================================== + Coverage 83.47% 83.56% +0.09% ========================================== Files 8 8 Lines 1271 1278 +7 ========================================== + Hits 1061 1068 +7 Misses 210 210 ```

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