fix: GetChild checks children length properly #1122

Job	Run time
cpp-lib-build (macos-12, clang, ON)	2m 29s
cpp-lib-build (macos-12, clang, OFF)	5m 38s
build (macos-12, tool)	1m 53s
cpp-lib-build (macos-12, gcc, ON)	2m 50s
build (macos-12, cpp)	14m 57s
cpp-lib-build (macos-12, gcc, OFF)	5m 14s
build (macos-12, csharp)	8m 21s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 41s
build (macos-12, dart)	5m 9s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 12s
build (macos-12, go)	3m 49s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 23s
build (macos-12, java)	4m 8s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 10s
build (macos-12, javascript)	3m 5s
cpp-lib-build (windows-2022, clang, ON)	2m 42s
build (macos-12, typescript)	12m 41s
cpp-lib-build (windows-2022, clang, OFF)	4m 9s
build (macos-12, php)	2m 31s
cpp-lib-build (windows-2022, cl)	4m 0s
build (macos-12, python3)	1m 50s
build (ubuntu-20.04, tool)	3m 19s
build (ubuntu-20.04, cpp)	17m 54s
build (ubuntu-20.04, csharp)	5m 21s
build (ubuntu-20.04, dart)	3m 50s
build (ubuntu-20.04, go)	2m 28s
build (ubuntu-20.04, java)	1m 13s
build (ubuntu-20.04, javascript)	1m 35s
build (ubuntu-20.04, typescript)	9m 48s
build (ubuntu-20.04, php)	1m 29s
build (ubuntu-20.04, python3)	1m 11s
build (windows-2022, tool)	1m 33s
build (windows-2022, cpp)	22m 49s
build (windows-2022, csharp)	6m 33s
build (windows-2022, dart)	4m 9s
build (windows-2022, go)	5m 39s
build (windows-2022, java)	4m 11s
build (windows-2022, javascript)	2m 23s
build (windows-2022, typescript)	18m 55s
build (windows-2022, php)	2m 4s
build (windows-2022, python3)	1m 41s
	3h 36m 57s

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