Correctly handle missing categorical data in experimental FIL #2870

Job	Run time
checks / check-style	2m 20s
changed-files / Check changed files	14s
checks / other-checks	39s
devcontainer / amd64, 12.5, conda	13m 8s
devcontainer / amd64, 12.5, pip	17m 45s
conda-cpp-build	0s
wheel-build-cuml	0s
clang-tidy	0s
conda-cpp-checks	0s
conda-python-build	0s
conda-cpp-tests	0s
wheel-tests-cuml	0s
conda-python-tests-dask	0s
optional-job-conda-python-tests-cudf-pandas-integration	0s
conda-python-tests-singlegpu	0s
conda-notebook-tests	0s
docs-build	0s
pr-builder / run	1s
	34m 7s

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