runaway: only check statements with a non-empty plan digest (#57582)

[ti-chi-bot]

This is an automated cherry-pick of #57582

What problem does this PR solve?

Issue Number: close #56897

Problem Summary:

What changed and how does it work?

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.

Release note

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

None

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@9862e83). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #57599   +/-   ##
================================================
  Coverage               ?   57.1836%           
================================================
  Files                  ?       1770           
  Lines                  ?     628647           
  Branches               ?          0           
================================================
  Hits                   ?     359483           
  Misses                 ?     245157           
  Partials               ?      24007           

Flag	Coverage Δ
integration	37.1752% <13.3333%> (?)
unit	72.8888% <90.0000%> (?)

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	52.4633% <0.0000%> (?)

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-22 02:54:16.888753784 +0000 UTC m=+173044.508408284: ☑️ agreed by JmPotato.
• 2024-11-22 13:48:14.39708401 +0000 UTC m=+212282.016738525: ☑️ agreed by glorv.