Handling errors within the steps in the loop

[paulsaxe]

Also added filtering the rows of tables, closes #17

[codecov]

Codecov Report

Merging #18 (048cbb5) into main (847da7f) will decrease coverage by 4.07%.
The diff coverage is 5.10%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   19.70%   15.63%   -4.08%     
==========================================
  Files           4        4              
  Lines         274      403     +129     
==========================================
+ Hits           54       63       +9     
- Misses        220      340     +120     

Flag	Coverage Δ
unittests	15.63% <5.10%> (-4.08%)	⬇️

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Impacted Files	Coverage Δ
loop_step/loop_parameters.py	87.50% <0.00%> (ø)
loop_step/loop_step.py	66.66% <ø> (ø)
loop_step/loop.py	9.70% <4.07%> (-1.46%)	⬇️
loop_step/__init__.py	100.00% <100.00%> (ø)

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[seamm]

I blieve these are OK; however, black has changed a lot making it difficult to see.