Fix some instances of null array key access #20580

Job	Run time
Gutenberg running from build / Linux	9m 41s
Core running from build / Linux	2m 35s
Core running from src / Linux	2m 19s
Core running from src / MacOS	3m 18s
Core running from build / MacOS	4m 43s
Gutenberg running from src / MacOS	14m 47s
Core running from src / Windows	4m 12s
Gutenberg running from src / Linux	9m 39s
Core running from build / Windows	4m 38s
Gutenberg running from build / MacOS	14m 10s
Gutenberg running from src / Windows	14m 55s
Gutenberg running from build / Windows	14m 6s
Slack Notifications	0s
Failed workflow tasks	-1s
	1h 39m 2s

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