FIX: Do not attempt to calculate TA if SliceTiming is degenerate

[effigies]

Fixes #2867.

[codecov-commenter]

Codecov Report

Base: 45.24% // Head: 45.83% // Increases project coverage by +0.59% 🎉

Coverage data is based on head (2ff25cb) compared to base (bdcc1d1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2901      +/-   ##
==========================================
+ Coverage   45.24%   45.83%   +0.59%     
==========================================
  Files          43       44       +1     
  Lines        3437     3637     +200     
==========================================
+ Hits         1555     1667     +112     
- Misses       1882     1970      +88     

Impacted Files	Coverage Δ
fmriprep/workflows/bold/outputs.py	22.46% <100.00%> (+0.16%)	⬆️
fmriprep/_version.py	42.09% <0.00%> (-2.63%)	⬇️
fmriprep/cli/tests/test_version.py	99.04% <0.00%> (-0.96%)	⬇️
fmriprep/cli/run.py	3.50% <0.00%> (-0.84%)	⬇️
fmriprep/workflows/bold/base.py	16.39% <0.00%> (-0.56%)	⬇️
fmriprep/reports/core.py	53.84% <0.00%> (ø)
fmriprep/interfaces/multiecho.py	79.31% <0.00%> (ø)
fmriprep/workflows/bold/confounds.py	10.49% <0.00%> (ø)
fmriprep/workflows/bold/resampling.py	10.32% <0.00%> (ø)
fmriprep/utils/debug.py	20.00% <0.00%> (ø)
... and 4 more

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[mgxd]

LGTM - Just to confirm, we're counting on the validator to catch cases where SliceTiming is not an array?

[effigies]

Yes.