Fix/tests

[satra]

closes #2448

[effigies]

tbss is the imported module. Maybe change the workflow vars to tbss_wf or similar?

Failing tests

[codecov-io]

Codecov Report

Merging #2451 into master will decrease coverage by 0.18%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2451      +/-   ##
==========================================
- Coverage    66.8%   66.61%   -0.19%     
==========================================
  Files         328      328              
  Lines       42456    42460       +4     
  Branches     5275     5277       +2     
==========================================
- Hits        28362    28284      -78     
- Misses      13406    13494      +88     
+ Partials      688      682       -6

Flag	Coverage Δ
#smoketests	50.68% <ø> (ø)	⬆️
#unittests	63.94% <33.33%> (-0.31%)	⬇️

Impacted Files	Coverage Δ
nipype/workflows/dmri/fsl/tbss.py	78.37% <33.33%> (-2.94%)	⬇️
nipype/interfaces/fsl/dti.py	66.22% <0%> (-10%)	⬇️
nipype/pipeline/plugins/multiproc.py	79.76% <0%> (-2.39%)	⬇️
nipype/interfaces/utility/base.py	88.2% <0%> (-1.69%)	⬇️
nipype/utils/profiler.py	43.1% <0%> (-1.15%)	⬇️
nipype/interfaces/fsl/utils.py	70.58% <0%> (-0.67%)	⬇️
nipype/interfaces/fsl/epi.py	65.18% <0%> (-0.5%)	⬇️
nipype/pipeline/engine/utils.py	82.29% <0%> (-0.46%)	⬇️
nipype/pipeline/engine/nodes.py	83.58% <0%> (-0.34%)	⬇️
nipype/interfaces/base/core.py	89.45% <0%> (-0.32%)	⬇️

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