Fix sge

[bpinsard]

fix QJobInfo.repr crashing silently in QstatSubstitute._parse_qstat_job_list
because _job_slots is not an int (not cast to int or "unknown")

[codecov-io]

Codecov Report

Merging #1810 into master will decrease coverage by -0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1810      +/-   ##
==========================================
- Coverage   69.82%   69.82%   -0.01%     
==========================================
  Files        1047     1047              
  Lines       52133    52133              
  Branches     7669     7669              
==========================================
- Hits        36403    36402       -1     
- Misses      14142    14143       +1     
  Partials     1588     1588

Flag	Coverage Δ
#unittests	69.82% <ø> (-0.01%)	❌

Impacted Files	Coverage Δ
nipype/pipeline/plugins/sge.py	17.74% <ø> (ø)	✅
nipype/pipeline/plugins/tests/test_multiproc.py	72.32% <ø> (-3.15%)	❌
nipype/pipeline/plugins/multiproc.py	77.65% <ø> (+2.23%)	✅

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