lightning: fix check table empty logic

[dsdashun]

What problem does this PR solve?

Issue Number: close #36746

Problem Summary:

What is changed and how it works?

Change the is table empty implementation logic: if the table doesn't exist, treat it as a 'table empty' scenario.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below):
  • Create a brand-new TiDB instance
  • Construct a program using the Lightning prechecker on 'table empty' check
  • See the check result and make sure it is passed
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• D3Hunter
• gozssky

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[dsdashun]

/run-integration-br-test

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/515abd566ac63d5c97e1350abefc786f500f9138

[dsdashun]

/cc @D3Hunter @buchuitoudegou @gozssky

[dsdashun]

/run-build

[dsdashun]

/run-build

[dsdashun]

/run-integration-br-test

[dsdashun]

/merge

[ti-chi-bot]

@dsdashun: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[dsdashun]

/assign @D3Hunter @gozssky

[sleepymole]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: da21d10

[sre-bot]

TiDB MergeCI notify

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci/integration-cdc-test	🟢 all 36 tests passed	31 min	Existing passed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 17 tests passed	20 min	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 11 tests passed	18 min	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 39 sec	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	5 min 27 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	5 min 8 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	4 min 58 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 10 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	3 min 1 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed