schedule: Fix possible nil pointer when getting command

[Connor1996]

Signed-off-by: Connor1996 zbk602423539@gmail.com

What problem does this PR solve?

Issue Number: Close #5540

What is changed and how does it work?

Keep the behavior as previous

Fix possible nil pointer when getting command

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch
• rleungx

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[codecov]

Codecov Report

Base: 75.45% // Head: 75.56% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (9a0af2c) compared to base (0f44e87).
Patch has no changes to coverable lines.

❗ Current head 9a0af2c differs from pull request most recent head 108d631. Consider uploading reports for the commit 108d631 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5542      +/-   ##
==========================================
+ Coverage   75.45%   75.56%   +0.10%     
==========================================
  Files         326      326              
  Lines       32282    32275       -7     
==========================================
+ Hits        24358    24388      +30     
+ Misses       5813     5773      -40     
- Partials     2111     2114       +3     

Flag	Coverage Δ
unittests	75.56% <ø> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/operator/step.go	81.73% <ø> (+3.96%)	⬆️
pkg/metricutil/metricutil.go	82.75% <0.00%> (-10.35%)	⬇️
server/id/id.go	83.05% <0.00%> (-6.78%)	⬇️
server/storage/kv/etcd_kv.go	79.71% <0.00%> (-5.80%)	⬇️
pkg/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
server/election/lease.go	84.05% <0.00%> (-2.90%)	⬇️
pkg/dashboard/adapter/manager.go	79.31% <0.00%> (-2.30%)	⬇️
server/server.go	73.54% <0.00%> (-1.65%)	⬇️
server/cluster/cluster.go	82.58% <0.00%> (-0.36%)	⬇️
server/schedulers/balance_region.go	87.24% <0.00%> (ø)
... and 18 more

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[nolouch]

need some tests.

[Connor1996]

need some tests.

It's covered by the test now

[Connor1996]

/merge

[ti-chi-bot]

@Connor1996: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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.

[ti-chi-bot]

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

Commit hash: 9a0af2c

[ti-chi-bot]

@Connor1996: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #5547.