Fix dask bugs

[goodwanghan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (ae269ee) 100.00% compared to head (75105da) 99.99%.

❗ Current head 75105da differs from pull request most recent head e5104fb. Consider uploading reports for the commit e5104fb to get more accurate results

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Additional details and impacted files

@@             Coverage Diff             @@
##            master     #507      +/-   ##
===========================================
- Coverage   100.00%   99.99%   -0.01%     
===========================================
  Files          128      128              
  Lines        12038    12041       +3     
===========================================
+ Hits         12038    12040       +2     
- Misses           0        1       +1     

Files Changed	Coverage Δ
fugue_dask/_utils.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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