Fix cleanup with null filename

[t-young31]

Resolves #223

Note: with the example in #223 there is now no exception thrown, but I don't think any files are actually deleted 😕

[codecov]

Codecov Report

Merging #224 (cbb8070) into v1.3.4 (af3daee) will increase coverage by 0.05%.
The diff coverage is 98.38%.

@@            Coverage Diff             @@
##           v1.3.4     #224      +/-   ##
==========================================
+ Coverage   97.08%   97.14%   +0.05%     
==========================================
  Files         195      196       +1     
  Lines       20011    20096      +85     
==========================================
+ Hits        19428    19522      +94     
+ Misses        583      574       -9     

Flag	Coverage Δ
unittests	97.14% <98.38%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_wrappers/test_nwchem.py	100.00% <ø> (ø)
tests/test_calculation.py	99.25% <66.66%> (-0.02%)	⬇️
tests/test_log.py	93.75% <66.66%> (-6.25%)	⬇️
tests/test_utils.py	96.51% <91.66%> (+0.19%)	⬆️
autode/__init__.py	100.00% <100.00%> (ø)
autode/atoms.py	100.00% <100.00%> (ø)
autode/calculations/executors.py	98.37% <100.00%> (ø)
autode/conformers/conformer.py	100.00% <100.00%> (ø)
autode/hessians.py	99.17% <100.00%> (ø)
autode/reactions/reaction.py	97.61% <100.00%> (+0.21%)	⬆️
... and 23 more

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[shoubhikraj]

finished review, approved 👍