Fix codacy issues

[codecov[bot]]

Codecov Report

Base: 83.11% // Head: 83.17% // Increases project coverage by +0.05% :tada:

Coverage data is based on head (b3c106e) compared to base (391ce83). Patch coverage: 65.51% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #91 +/- ## =========================================== + Coverage 83.11% 83.17% +0.05% =========================================== Files 46 46 Lines 4223 4238 +15 =========================================== + Hits 3510 3525 +15 Misses 713 713 ``` | [Impacted Files](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics) | Coverage Δ | | |---|---|---| | [covigator/dashboard/figures/recurrent\_mutations.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL2Rhc2hib2FyZC9maWd1cmVzL3JlY3VycmVudF9tdXRhdGlvbnMucHk=) | `21.67% <6.00%> (ø)` | | | [covigator/processor/ena\_processor.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL3Byb2Nlc3Nvci9lbmFfcHJvY2Vzc29yLnB5) | `52.00% <50.00%> (ø)` | | | [covigator/pipeline/vcf\_loader.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL3BpcGVsaW5lL3ZjZl9sb2FkZXIucHk=) | `96.00% <97.29%> (+0.41%)` | :arrow_up: | | [covigator/accessor/abstract\_accessor.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL2FjY2Vzc29yL2Fic3RyYWN0X2FjY2Vzc29yLnB5) | `97.22% <100.00%> (+0.07%)` | :arrow_up: | | [covigator/accessor/ena\_accessor.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL2FjY2Vzc29yL2VuYV9hY2Nlc3Nvci5weQ==) | `85.71% <100.00%> (ø)` | | | [covigator/tests/unit\_tests/test\_vcf\_loader.py](https://codecov.io/gh/TRON-Bioinformatics/covigator/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics#diff-Y292aWdhdG9yL3Rlc3RzL3VuaXRfdGVzdHMvdGVzdF92Y2ZfbG9hZGVyLnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TRON-Bioinformatics)

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