[REVIEW] Fix access to attributes of individual NB objects in dask NB

[dantegd]

Fixes #3150

[GPUtester]

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[cjnolet]

@dantegd Ah, was this from the recent cuml array changes?

[dantegd]

@cjnolet yeah

[beckernick]

Is there a pytest we can add or enhance in this PR to catch this?

[dantegd]

@beckernick will add a pytest before merging, good point

[codecov-io]

Codecov Report

Merging #3152 (d9f876d) into branch-0.17 (238a8de) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           branch-0.17    #3152      +/-   ##
===============================================
- Coverage        70.57%   70.50%   -0.08%     
===============================================
  Files              197      196       -1     
  Lines            15465    15442      -23     
===============================================
- Hits             10915    10887      -28     
- Misses            4550     4555       +5     

Impacted Files	Coverage Δ
python/cuml/dask/naive_bayes/naive_bayes.py	42.10% <0.00%> (ø)
python/cuml/common/import_utils.py	55.43% <0.00%> (-3.27%)	⬇️
python/cuml/benchmark/bench_helper_funcs.py	71.00% <0.00%> (-2.00%)	⬇️
python/cuml/pytest_benchmarks/test_bench.py

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[dantegd]

@beckernick just added a minimal example, let me know if you think that covers the issue well enough or you think we should add a sparse X test as well