Bug fix when creating dataset from zarr

[b8raoult]

Addressing #46

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 88.83%. Comparing base (436fe5d) to head (6f00edb).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
tests/xarray/test_zarr.py	83.33%	2 Missing ⚠️
tests/xarray/test_netcdf.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #49      +/-   ##
===========================================
- Coverage    89.03%   88.83%   -0.21%     
===========================================
  Files            9        9              
  Lines          748      761      +13     
===========================================
+ Hits           666      676      +10     
- Misses          82       85       +3     

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