Don't raise error on len of empty Batch

[MischaPanch]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.20%. Comparing base (bf0d632) to head (e327caa).

❗ Current head e327caa differs from pull request most recent head c842ece. Consider uploading reports for the commit c842ece to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1084      +/-   ##
==========================================
- Coverage   88.21%   88.20%   -0.02%     
==========================================
  Files         100      100              
  Lines        8300     8300              
==========================================
- Hits         7322     7321       -1     
- Misses        978      979       +1     

Flag	Coverage Δ
unittests	88.20% <100.00%> (-0.02%)	⬇️

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