tabls: fix resp is nil and change resp check (#52035)

[ti-chi-bot]

This is an automated cherry-pick of #52035

What problem does this PR solve?

Issue Number: close #52034

Problem Summary:

What changed and how does it work?

check resp is nil

Check List

Tests

• Unit test
• Integration test
• No need to test

  • I checked and no code files have been changed.

Release note

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

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JmPotato, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-25 04:16:29.791822208 +0000 UTC m=+1868616.814068595: ☑️ agreed by JmPotato.
• 2024-03-25 04:17:56.693244953 +0000 UTC m=+1868703.715491340: ☑️ agreed by tangenta.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-8.0@4a4b8d6). Click here to learn what that means.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.0     #52053   +/-   ##
================================================
  Coverage               ?   70.6439%           
================================================
  Files                  ?       1477           
  Lines                  ?     438345           
  Branches               ?          0           
================================================
  Hits                   ?     309664           
  Misses                 ?     109216           
  Partials               ?      19465           

Flag	Coverage Δ
unit	70.4336% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	45.7989% <0.0000%> (?)

[JmPotato]

/test check_dev

[ti-chi-bot]

@JmPotato: The specified target(s) for /test were not found.
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@JmPotato: No presubmit jobs available for pingcap/tidb@release-8.0

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[JmPotato]

/test check-dev

[HuSharp]

/test check_dev

[tiprow]

@JmPotato: No presubmit jobs available for pingcap/tidb@release-8.0

In response to this:

/test check-dev

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