[Bug](pipeline) nullprt may be close the sink if init failed

[HappenLee]

Proposed changes

Issue Number: close #xxx

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[HappenLee]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 46.27 seconds
stream load tsv: 573 seconds loaded 74807831229 Bytes, about 124 MB/s
stream load json: 20 seconds loaded 2358488459 Bytes, about 112 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 28.7 seconds inserted 10000000 Rows, about 348K ops/s
storage size: 17162241700 Bytes

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.33% (8142/22413)
Line Coverage: 28.44% (65160/229096)
Region Coverage: 27.41% (33792/123303)
Branch Coverage: 24.07% (17250/71672)
Coverage Report: http://coverage.selectdb-in.cc/coverage/d5a5cb718014b2ffcd52e488931ed1b6274d8283_d5a5cb718014b2ffcd52e488931ed1b6274d8283/report/index.html

[yiguolei]

LGTM