Filtered catalog should retain path. Add friendlier check for in-memo…

[delucchi-cmu]

The following scenario occured:

import lsdb
catalog = lsdb.read_hats(...)
catalog = catalog.cone_search(...)
catalog.aggregate_column_statistics()

This resulted in an error in the aggregate_column_statistics because the path became None during the geometric filter application.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.11%. Comparing base (a58935f) to head (ab67014).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #470      +/-   ##
==========================================
+ Coverage   93.10%   93.11%   +0.01%     
==========================================
  Files          47       47              
  Lines        2044     2049       +5     
==========================================
+ Hits         1903     1908       +5     
  Misses        141      141              

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[github-actions]

Before [a58935f]	After [a707a36]	Ratio	Benchmark (Parameter)
72.6±0.8ms	73.4±0.6ms	1.01	benchmarks.MetadataSuite.time_load_partition_join_info
350±0.8ms	353±3ms	1.01	benchmarks.Suite.time_outer_pixel_alignment
73.1±0.4ms	73.0±1ms	1	benchmarks.MetadataSuite.time_load_partition_info_order7
12.3±0.07ms	12.3±0.5ms	1	benchmarks.Suite.time_inner_pixel_alignment
106±0.5ms	106±1ms	1	benchmarks.time_test_alignment_even_sky
1.03±0.03ms	1.03±0.02ms	1	benchmarks.time_test_cone_filter_multiple_order
18.8±0.1ms	18.6±0.3ms	0.99	benchmarks.MetadataSuite.time_load_partition_info_order6
39.2±0.2ms	38.9±0.8ms	0.99	benchmarks.Suite.time_pixel_tree_creation

Click here to view all benchmarks.

[camposandro]

Thanks, it looks good!