Be safer around none values in metadata statistics.

[delucchi-cmu]

If metadata files are lacking statistics, or contain only none values within in a partition, we should confirm that we're not making none comparisons.

Note that we are not able to rely on numpy's nanmin kind of methods, as these are None, and will not have the same type.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.19%. Comparing base (af79a37) to head (8ca5744).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #460      +/-   ##
==========================================
+ Coverage   93.14%   93.19%   +0.04%     
==========================================
  Files          47       47              
  Lines        2014     2028      +14     
==========================================
+ Hits         1876     1890      +14     
  Misses        138      138              

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[github-actions]

Before [af79a37]	After [37154cf]	Ratio	Benchmark (Parameter)
1.03±0.02ms	1.03±0.02ms	1.01	benchmarks.time_test_cone_filter_multiple_order
73.4±0.4ms	73.1±0.3ms	1	benchmarks.MetadataSuite.time_load_partition_info_order7
39.6±0.3ms	39.5±0.6ms	1	benchmarks.Suite.time_pixel_tree_creation
108±0.4ms	107±0.5ms	1	benchmarks.time_test_alignment_even_sky
73.4±0.4ms	72.3±0.2ms	0.99	benchmarks.MetadataSuite.time_load_partition_join_info
359±3ms	355±2ms	0.99	benchmarks.Suite.time_outer_pixel_alignment
18.8±0.1ms	18.4±0.2ms	0.98	benchmarks.MetadataSuite.time_load_partition_info_order6
13.0±0.2ms	12.3±0.7ms	0.95	benchmarks.Suite.time_inner_pixel_alignment

Click here to view all benchmarks.