fix taskfarmer errors when genome folder is an integer

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.21%. Comparing base (827bf2c) to head (325caaf).

Files	Patch %	Lines
src/loaders/compute_tools/tool_common.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #744 +/- ## ======================================== Coverage 46.21% 46.21% ======================================== Files 78 78 Lines 7028 7028 ======================================== Hits 3248 3248 Misses 3780 3780 ```

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