executor: fix nil pointer for query on tikv_region_status with non-exist table id (#57534)

[ti-chi-bot]

This is an automated cherry-pick of #57534

What problem does this PR solve?

Issue Number: close #57530

Problem Summary:

What changed and how does it work?

select * from TIKV_REGION_STATUS where table_id = 81920
when the table id does not exist, the allRegionsInfo is nil,
We should check it to avoid runtime nil pointer error.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

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]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-20 14:36:04.481646554 +0000 UTC m=+42352.101301070: ☑️ agreed by Defined2014.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.5@f2efff9). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #57565   +/-   ##
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Flag	Coverage Δ
integration	36.6628% <100.0000%> (?)
unit	72.4847% <0.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9478% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2395% <0.0000%> (?)

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