[FIX] EpiReg changed to not list certain outputs when 'wmseg' input is specified

[oliver-contier]

Summary

Fixes #3264

FSL's epi_reg script does not perform segmentation when a white matter segmented file is already provided. Hence, the interface should not check whether the 'seg' output exists in in case a 'wmseg' input is specified.

List of changes proposed in this PR (pull-request)

• added simple conditional to the _list_outputs() methods of the EpiReg interface such that the outputs 'seg', 'wmseg', and 'wmedge' are not listed when 'wmseg' is already specified as an input

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #3265 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3265      +/-   ##
==========================================
- Coverage   64.98%   64.98%   -0.01%     
==========================================
  Files         302      302              
  Lines       39940    39941       +1     
  Branches     5280     5281       +1     
==========================================
  Hits        25956    25956              
- Misses      12913    12914       +1     
  Partials     1071     1071              

Flag	Coverage Δ
#unittests	64.98% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
nipype/interfaces/fsl/epi.py	61.96% <0.00%> (-0.13%)	⬇️

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[effigies]

Lgtm.