FIX for [#2557](https://github.com/nipy/nipype/issues/2557#issuecomment-384834681)

[eort]

Fixes #2557

Changes proposed in this pull request

• Don't override empty node config file with the default config information

[eort]

closed in place of #2559

[codecov-io]

Codecov Report

Merging #2558 into master will decrease coverage by 0.5%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2558      +/-   ##
==========================================
- Coverage   67.12%   66.62%   -0.51%     
==========================================
  Files         333      328       -5     
  Lines       42538    42507      -31     
  Branches     5265     5280      +15     
==========================================
- Hits        28554    28320     -234     
- Misses      13283    13505     +222     
+ Partials      701      682      -19

Flag	Coverage Δ
#smoketests	50.73% <ø> (+0.05%)	⬆️
#unittests	63.95% <ø> (-0.5%)	⬇️

Impacted Files	Coverage Δ
nipype/pipeline/engine/nodes.py	83.55% <ø> (-0.39%)	⬇️
nipype/utils/nipype2boutiques.py	12.03% <0%> (-56.36%)	⬇️
nipype/interfaces/dtitk/utils.py	60.73% <0%> (-31.79%)	⬇️
nipype/scripts/instance.py	37.5% <0%> (-18.75%)	⬇️
nipype/interfaces/ants/base.py	61.7% <0%> (-10.64%)	⬇️
nipype/interfaces/fsl/aroma.py	68.42% <0%> (-7.34%)	⬇️
nipype/algorithms/metrics.py	52.94% <0%> (-5.42%)	⬇️
nipype/pipeline/engine/base.py	83.63% <0%> (-4.83%)	⬇️
nipype/interfaces/dtitk/registration.py	80% <0%> (-4.31%)	⬇️
nipype/interfaces/dcm2nii.py	43.06% <0%> (-4.14%)	⬇️
... and 116 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c9315ca...79d4018. Read the comment docs.