Fix empty upsert with sink

[nikvas0]

Changelog entry

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Description for reviewers

Fix empty upsert with sink

[github-actions]

🟢 2025-04-21 11:16:00 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-04-21 11:17:37 UTC Pre-commit check linux-x86_64-release-asan for e9bc2c6 has started.
⚪ 2025-04-21 11:17:47 UTC Artifacts will be uploaded here
⚪ 2025-04-21 11:20:39 UTC ya make is running...
🟡 2025-04-21 12:40:42 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12519	12362	0	99	31	27

⚪ 2025-04-21 12:41:45 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-04-21 12:55:35 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
201 (only retried tests)	126	0	39	14	22

⚪ 2025-04-21 12:55:44 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-04-21 13:08:27 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
96 (only retried tests)	35	0	32	6	23

🟢 2025-04-21 13:08:37 UTC Build successful.
🟢 2025-04-21 13:09:09 UTC ydbd size 3.9 GiB changed* by +1.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 7f0d628	merge: e9bc2c6	diff	diff %
ydbd size	4 148 049 592 Bytes	4 148 050 736 Bytes	+1.1 KiB	+0.000%
ydbd stripped size	1 432 034 648 Bytes	1 432 035 352 Bytes	+704 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]

⚪ 2025-04-21 11:22:32 UTC Pre-commit check linux-x86_64-relwithdebinfo for e9bc2c6 has started.
⚪ 2025-04-21 11:22:40 UTC Artifacts will be uploaded here
⚪ 2025-04-21 11:25:23 UTC ya make is running...
🟡 2025-04-21 12:27:02 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
20173	18802	0	1	1261	109

⚪ 2025-04-21 12:28:42 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-04-21 12:40:31 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
165 (only retried tests)	69	0	0	0	96

🟢 2025-04-21 12:40:38 UTC Build successful.
🟢 2025-04-21 12:41:04 UTC ydbd size 2.2 GiB changed* by +992 Bytes, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 7f0d628	merge: e9bc2c6	diff	diff %
ydbd size	2 363 869 888 Bytes	2 363 870 880 Bytes	+992 Bytes	+0.000%
ydbd stripped size	493 930 496 Bytes	493 930 816 Bytes	+320 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}