Fix null handling for Arrow data (#6227) #7661

Job	Run time
r-package (ubuntu-latest, gcc, R 3.6, cmake)	37s
r-package (debian, R-devel, clang)	13m 32s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	10m 10s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	14m 44s
r-package (ubuntu-latest, clang, R 3.6, cmake)	11m 25s
r-package (ubuntu-latest, clang, R 4.3, cmake)	9m 56s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	31m 21s
r-package (macOS-latest, gcc, R 4.3, cmake)	12m 10s
r-package (macOS-latest, clang, R 4.3, cmake)	16m 41s
r-package (windows-latest, MINGW, R 3.6, cmake)	15m 20s
r-package (windows-latest, MINGW, R 4.3, cmake)	18m 2s
r-package (windows-2019, MSVC, R 3.6, cmake)	14m 10s
r-package (windows-2022, MSVC, R 4.3, cmake)	15m 20s
r-package (windows-latest, MINGW, R 3.6, cran)	23m 13s
r-package (windows-latest, MINGW, R 4.3, cran)	20m 27s
r-package (ubuntu-latest, gcc, R 4.3, cran)	15m 38s
r-package (macOS-latest, clang, R 4.3, cran)	21m 9s
r-rchk (ubuntu-latest, gcc, R 4.3, cran)	10m 22s
all-r-package-jobs-successful	2s
	4h 34m 19s

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