None value saving

[AlexanderCaichen]

Workaround for issue https://github.com/aristoteleo/dynamo-release/issues/561 (or issue https://github.com/aristoteleo/dynamo-release/issues/440), where anndata dictionary entries with None values are deleted when adata.write() is called.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (b074392) 22.56% compared to head (2a16e1e) 22.56%.

Files	Patch %	Lines
dynamo/data_io.py	0.00%	5 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #634      +/-   ##
==========================================
- Coverage   22.56%   22.56%   -0.01%     
==========================================
  Files         166      166              
  Lines       27548    27550       +2     
==========================================
  Hits         6216     6216              
- Misses      21332    21334       +2     

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