Backport: gh-3143 to 1.3.x branch

[effigies]

Backports #3143 to 1.3.x.

• fix: mapnode to generate result file when crashes in single node mode
• enh: simplify test further

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

[effigies]

Confirming that this branch also fixes #3088.

[codecov]

Codecov Report

Merging #3144 into maint/1.3.x will decrease coverage by 0.05%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           maint/1.3.x    #3144      +/-   ##
===============================================
- Coverage         68.2%   68.14%   -0.06%     
===============================================
  Files              297      297              
  Lines            39815    39822       +7     
  Branches          5218     5218              
===============================================
- Hits             27154    27137      -17     
- Misses           11951    11974      +23     
- Partials           710      711       +1

Flag	Coverage Δ
#smoketests	51.76% <50%> (ø)	⬆️
#unittests	65.37% <100%> (-0.11%)	⬇️

Impacted Files	Coverage Δ
nipype/info.py	90.14% <ø> (ø)	⬆️
nipype/pipeline/engine/nodes.py	83.6% <100%> (+0.18%)	⬆️
nipype/interfaces/dcm2nii.py	59.06% <0%> (-6.05%)	⬇️
nipype/pipeline/plugins/legacymultiproc.py	63% <0%> (-5%)	⬇️
nipype/pipeline/plugins/tools.py	79.48% <0%> (-1.29%)	⬇️
nipype/pipeline/engine/utils.py	80.65% <0%> (-0.12%)	⬇️
nipype/__init__.py	61.9% <0%> (+1.58%)	⬆️

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