fixes for dask

[djarecka]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -4.10% ⚠️

Comparison is base (29d3d1f) 82.88% compared to head (c7384b9) 78.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #689      +/-   ##
==========================================
- Coverage   82.88%   78.79%   -4.10%     
==========================================
  Files          22       22              
  Lines        4845     4848       +3     
  Branches     1391     1392       +1     
==========================================
- Hits         4016     3820     -196     
+ Misses        825      823       -2     
- Partials        4      205     +201     

Flag	Coverage Δ
unittests	78.65% <100.00%> (-4.24%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pydra/engine/workers.py	22.73% <100.00%> (+3.45%)	⬆️

... and 16 files with indirect coverage changes

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[djarecka]

my changes were already merged to #686 so closing this