fix abort on invalid null value parsing in BinaryJson

[swalrus1]

parsing of jsons, such as: nul failed with Y_ABORT

logs: http://distbuild-fileproxy-prod-fileproxy-27.sas.yp-c.yandex.net:50001/tmpa0g7_9jx/testing_out_stuff.tar.zstd/fuzz.err

[github-actions]

⚪ 2024-10-28 11:56:39 UTC Pre-commit check linux-x86_64-release-asan for 4576fb4 has started.
⚪ 2024-10-28 11:57:10 UTC Artifacts will be uploaded here
⚪ 2024-10-28 12:00:26 UTC ya make is running...
⚫ 2024-10-28 12:09:27 UTC Check cancelled

[github-actions]

⚪ 2024-10-28 11:57:12 UTC Pre-commit check linux-x86_64-relwithdebinfo for 4576fb4 has started.
⚪ 2024-10-28 11:57:23 UTC Artifacts will be uploaded here
⚪ 2024-10-28 12:00:30 UTC ya make is running...
⚫ 2024-10-28 12:09:20 UTC Check cancelled

[github-actions]

⚪ 2024-10-28 12:12:32 UTC Pre-commit check linux-x86_64-relwithdebinfo for 3b1b951 has started.
⚪ 2024-10-28 12:12:43 UTC Artifacts will be uploaded here
⚪ 2024-10-28 12:15:49 UTC ya make is running...
🟡 2024-10-28 13:43:04 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
79244	65190	0	3	13953	98

⚪ 2024-10-28 13:50:36 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-10-28 14:02:41 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
101 (only retried tests)	8	0	0	0	93

🟢 2024-10-28 14:02:48 UTC Build successful.
🟢 2024-10-28 14:03:06 UTC ydbd size 2.8 GiB changed* by -176 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: f752bc1	merge: 3b1b951	diff	diff %
ydbd size	3 033 679 416 Bytes	3 033 679 240 Bytes	-176 Bytes	-0.000%
ydbd stripped size	480 648 664 Bytes	480 648 536 Bytes	-128 Bytes	-0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2024-10-28 12:13:44 UTC Pre-commit check linux-x86_64-release-asan for 3b1b951 has started.
⚪ 2024-10-28 12:13:55 UTC Artifacts will be uploaded here
⚪ 2024-10-28 12:17:09 UTC ya make is running...
🟡 2024-10-28 13:57:18 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
15482	15284	0	48	51	99

🟢 2024-10-28 13:58:35 UTC Build successful.
🟢 2024-10-28 13:59:08 UTC ydbd size 5.7 GiB changed* by -104 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: f752bc1	merge: 3b1b951	diff	diff %
ydbd size	6 139 270 880 Bytes	6 139 270 776 Bytes	-104 Bytes	-0.000%
ydbd stripped size	1 531 999 984 Bytes	1 531 999 536 Bytes	-448 Bytes	-0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}