PYTHON-5013 Add NULL checks in InvalidDocument bson handling #1296

Job	Run time
Make SDist	26s
Build wheels for manylinux_x86_64	2m 26s
Build wheels for manylinux_aarch64	10m 37s
Build wheels for manylinux_ppc64le	9m 48s
Build wheels for manylinux_s390x	10m 36s
Build wheels for manylinux_i686	2m 28s
Build wheels for win_amd6	4m 17s
Build wheels for win32	5m 10s
Build wheels for macos	3m 53s
Download Wheels	5s
	49m 46s

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