Fix null handling for Arrow data #7651

Job	Run time
r-package (ubuntu-latest, gcc, R 3.6, cmake)	12m 2s
r-package (debian, R-devel, clang)	12m 53s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	9m 58s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	14m 57s
r-package (ubuntu-latest, clang, R 3.6, cmake)	12m 2s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	30m 35s
r-package (ubuntu-latest, clang, R 4.3, cmake)	10m 32s
r-package (macOS-latest, gcc, R 4.3, cmake)	16m 57s
r-package (macOS-latest, clang, R 4.3, cmake)	11m 2s
r-package (windows-latest, MINGW, R 3.6, cmake)	15m 13s
r-package (windows-latest, MINGW, R 4.3, cmake)	24m 4s
r-package (windows-2019, MSVC, R 3.6, cmake)	12m 0s
r-package (windows-2022, MSVC, R 4.3, cmake)	21m 5s
r-package (windows-latest, MINGW, R 3.6, cran)	27m 15s
r-package (windows-latest, MINGW, R 4.3, cran)	21m 10s
r-package (ubuntu-latest, gcc, R 4.3, cran)	15m 55s
r-package (macOS-latest, clang, R 4.3, cran)	24m 43s
r-rchk (ubuntu-latest, gcc, R 4.3, cran)	9m 51s
all-r-package-jobs-successful	2s
	5h 2m 16s

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