[FIX] Resource monitoring minor bugfix

[oesteban]

Fixes #2241

[codecov-io]

Codecov Report

Merging #2244 into master will decrease coverage by <.01%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master    #2244      +/-   ##
==========================================
- Coverage   72.32%   72.32%   -0.01%     
==========================================
  Files        1182     1182              
  Lines       58951    58955       +4     
  Branches     8486     8486              
==========================================
  Hits        42638    42638              
- Misses      14929    14933       +4     
  Partials     1384     1384

Flag	Coverage Δ
#smoketests	72.32% <60%> (-0.01%)	⬇️
#unittests	69.89% <60%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
nipype/utils/profiler.py	41.56% <60%> (+0.2%)	⬆️
nipype/pipeline/plugins/multiproc.py	76.76% <0%> (-1.41%)	⬇️

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