Make LogEncoder more robust

[krzentner]

This hopefully fixes #2328

[codecov]

Codecov Report

Merging #2329 (58874e8) into master (3492f44) will decrease coverage by 0.03%.
The diff coverage is 83.78%.

❗ Current head 58874e8 differs from pull request most recent head af07a6c. Consider uploading reports for the commit af07a6c to get more accurate results

@@            Coverage Diff             @@
##           master    #2329      +/-   ##
==========================================
- Coverage   91.25%   91.21%   -0.04%     
==========================================
  Files         199      199              
  Lines       10985    10987       +2     
  Branches     1601     1601              
==========================================
- Hits        10024    10022       -2     
- Misses        696      701       +5     
+ Partials      265      264       -1     

Impacted Files	Coverage Δ
src/garage/experiment/experiment.py	92.91% <83.78%> (+0.05%)	⬆️
src/garage/np/_functions.py	77.39% <0.00%> (-1.74%)	⬇️
src/garage/sampler/multiprocessing_sampler.py	90.12% <0.00%> (-1.24%)	⬇️

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