24.3: Fix null dereference in node broker (KIKIMR-21693) (#6516)

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Changelog entry

Fix null pointer dereference during node registration in Node Broker.

Changelog category

• Bugfix

[github-actions]

⚪ 2024-07-12 12:38:17 UTC Pre-commit check for 4d1d1a8 has started.
⚪ 2024-07-12 12:41:28 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-07-12 13:19:03 UTC Build successful.
⚪ 2024-07-12 13:19:17 UTC Tests are running...
🔴 2024-07-12 14:50:29 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14091	12764	0	1	1307	19

🟢 2024-07-12 14:51:05 UTC ydbd size 8.1 GiB changed* by +31.3 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: 0e4b669	merge: 4d1d1a8	diff	diff %
ydbd size	8 726 657 816 Bytes	8 726 689 832 Bytes	+31.3 KiB	+0.000%
ydbd stripped size	477 173 864 Bytes	477 179 816 Bytes	+5.8 KiB	+0.001%

^{*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]

⚪ 2024-07-12 12:38:19 UTC Pre-commit check for 4d1d1a8 has started.
⚪ 2024-07-12 12:41:11 UTC Build linux-x86_64-release-clang14 is running...
🟢 2024-07-12 12:52:06 UTC Build successful.

[github-actions]

⚪ 2024-07-12 12:44:23 UTC Pre-commit check for 4d1d1a8 has started.
⚪ 2024-07-12 12:46:53 UTC Build linux-x86_64-release-asan is running...
🟢 2024-07-12 13:08:42 UTC Build successful.
⚪ 2024-07-12 13:08:52 UTC Tests are running...
🔴 2024-07-12 15:12:28 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
9809	9230	0	86	321	172

🟢 2024-07-12 15:13:16 UTC ydbd size 5.2 GiB changed* by +22.4 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: 0e4b669	merge: 4d1d1a8	diff	diff %
ydbd size	5 616 270 384 Bytes	5 616 293 360 Bytes	+22.4 KiB	+0.000%
ydbd stripped size	1 211 197 832 Bytes	1 211 201 896 Bytes	+4.0 KiB	+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}