Remove redundant usage of nullish coalescing operator #11653

Job	Run time
lint-frontend	1m 16s
lint-misc	52s
lint-python-flake8 (3.9)	13s
build-data-server-pip (native, ubuntu-20.04, 1.65.0)	1m 7s
lint-python-flake8 (3.10)	14s
build-data-server-pip (native, macos-12, 1.65.0)	1m 36s
lint-python-yaml-docs	19s
lint-python-flake8 (3.11)	11s
lint-rust (1.65.0, 0.16.1)	29s
build-data-server-pip (universal, ubuntu-20.04, 1.65.0)	7s
build (tf, 3.9)	11m 3s
build (notf, 3.9)	7m 13s
	24m 40s

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