fix empty variable usage

[ivanmorozov333]

• Bugfix

[github-actions]

⚪ 2024-11-25 09:35:57 UTC Pre-commit check linux-x86_64-release-asan for 68a5c8d has started.
⚫ 2024-11-25 09:36:09 UTC Check cancelled

[github-actions]

⚪ 2024-11-25 09:37:53 UTC Pre-commit check linux-x86_64-release-asan for 99a8749 has started.
⚪ 2024-11-25 09:38:05 UTC Artifacts will be uploaded here
⚪ 2024-11-25 09:41:01 UTC ya make is running...
🟡 2024-11-25 10:48:01 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?
8978	8908	0	19	5	46

🟢 2024-11-25 10:48:53 UTC Build successful.
🟢 2024-11-25 10:50:09 UTC ydbd size 4.9 GiB changed* by +20.8 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 38572a8	merge: 99a8749	diff	diff %
ydbd size	5 284 305 560 Bytes	5 284 326 848 Bytes	+20.8 KiB	+0.000%
ydbd stripped size	1 359 965 488 Bytes	1 359 968 496 Bytes	+2.9 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}

[github-actions]

⚪ 2024-11-25 09:38:41 UTC Pre-commit check linux-x86_64-relwithdebinfo for 99a8749 has started.
⚪ 2024-11-25 09:38:52 UTC Artifacts will be uploaded here
⚪ 2024-11-25 09:41:45 UTC ya make is running...
🟢 2024-11-25 10:29:57 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
15201	13695	0	0	1395	111

🟢 2024-11-25 10:31:18 UTC Build successful.
🟢 2024-11-25 10:31:36 UTC ydbd size 2.5 GiB changed* by +7.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 8f553e4	merge: 99a8749	diff	diff %
ydbd size	2 690 049 216 Bytes	2 690 056 568 Bytes	+7.2 KiB	+0.000%
ydbd stripped size	482 184 656 Bytes	482 185 488 Bytes	+832 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}