fix: allow more runtime errors in find_batch_size()

[qin-yu]

This attempts to fix #358.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 64.89%. Comparing base (36e9445) to head (d8ffe1d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...antseg/functionals/prediction/utils/size_finder.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   64.94%   64.89%   -0.06%     
==========================================
  Files          71       71              
  Lines        5177     5181       +4     
==========================================
  Hits         3362     3362              
- Misses       1815     1819       +4     

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