FIX: Log incomplete fieldmaps, rather than erroring

[effigies]

If a dataset has a PEPolar B0FieldSource where one image is in fmap and the other in dwi, the fieldmap wrangler as called from fMRIPrep will fail because we filter out dwi at indexing time. This shouldn't be a problem (unless somebody for some reason wants to correct their BOLD with a DWI image...), so we should just note that we were unable to construct the fieldmap and move on.

[codecov-commenter]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.12 ⚠️

Comparison is base (188bc87) 88.56% compared to head (8173e92) 88.45%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   88.56%   88.45%   -0.12%     
==========================================
  Files          25       25              
  Lines        2082     2087       +5     
  Branches      324      325       +1     
==========================================
+ Hits         1844     1846       +2     
- Misses        197      200       +3     
  Partials       41       41              

Flag	Coverage Δ
travis	83.32% <66.66%> (-0.11%)	⬇️
unittests	88.28% <66.66%> (-0.12%)	⬇️

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

Impacted Files	Coverage Δ
sdcflows/utils/wrangler.py	93.16% <66.66%> (-2.38%)	⬇️

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