FIX: IntraModalMerge failed for dims (x, y, z, 1)

[oesteban]

See nipreps/sdcflows#77.

I'll try to add a regression test for this ASAP. For now, it'd be good to have your opinion on how I'm using nibabel, Chris.

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     FIX: IntraModalMerge failed for dims (x, y, z, 1)

     fix: address @effigies' comments and add tests

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[codecov]

Codecov Report

Merging #441 into master will decrease coverage by 4.68%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master     #441      +/-   ##
==========================================
- Coverage   59.94%   55.25%   -4.69%     
==========================================
  Files          57       42      -15     
  Lines        5480     4852     -628     
  Branches      647      652       +5     
==========================================
- Hits         3285     2681     -604     
+ Misses       2152     2046     -106     
- Partials       43      125      +82

Flag	Coverage Δ
#masks	?
#reportlettests	?
#unittests	?

Impacted Files	Coverage Δ
niworkflows/interfaces/images.py	52.13% <57.14%> (-0.11%)	⬇️
niworkflows/func/util.py	28% <0%> (-52%)	⬇️
niworkflows/interfaces/fixes.py	41.17% <0%> (-45.1%)	⬇️
niworkflows/interfaces/ants.py	57.81% <0%> (-16.15%)	⬇️
niworkflows/engine/workflows.py	26.31% <0%> (-15.79%)	⬇️
niworkflows/interfaces/bids.py	80.15% <0%> (-15.48%)	⬇️
niworkflows/interfaces/utility.py	75.47% <0%> (-13.21%)	⬇️
niworkflows/utils/bids.py	75.94% <0%> (-12.81%)	⬇️
niworkflows/interfaces/itk.py	28.39% <0%> (-10.5%)	⬇️
niworkflows/interfaces/registration.py	51.72% <0%> (-10.35%)	⬇️
... and 23 more

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