Fix write_cog for geoboxes with null crs

[Ariana-B]

If a geobox has a CRS value of None, it will break write-cog - the crs value in rio_opts will be set to str(None), which causes rio_copy to error: rasterio.errors.CRSError: The WKT could not be parsed. OGR Error code 5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.44%. Comparing base (a00c882) to head (198714d).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #186   +/-   ##
========================================
  Coverage    95.44%   95.44%           
========================================
  Files           31       31           
  Lines         5534     5534           
========================================
  Hits          5282     5282           
  Misses         252      252           

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[github-actions]

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