Address warning on writing catalog.

[delucchi-cmu]

Closes #478

I was looking into something unrelated, and observed this and got annoyed.

[OliviaLynn]

Nice

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.67%. Comparing base (3041d6d) to head (80237d5).
Report is 66 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #488   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files          39       39           
  Lines        1546     1546           
=======================================
  Hits         1510     1510           
  Misses         36       36           

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[github-actions]

Before [3041d6d]	After [ce38e95]	Ratio	Benchmark (Parameter)
15.8±0.08ms	15.5±0.2ms	0.98	benchmarks.time_box_filter_on_partition
14.4±0.07s	14.2±0.01s	0.98	benchmarks.time_create_large_catalog
2.16±0.01s	2.12±0.01s	0.98	benchmarks.time_create_midsize_catalog
102±1ms	101±2ms	0.98	benchmarks.time_kdtree_crossmatch
29.8±0.5ms	29.4±0.4ms	0.98	benchmarks.time_polygon_search

Click here to view all benchmarks.