cluster: fix progressBar return nil

[nexustar]

What problem does this PR solve?

cluster: fix progressBar return nil

What is changed and how it works?

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AstroProfundis

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 3713716

[codecov-commenter]

Codecov Report

Merging #1624 (3713716) into master (ce8eb0a) will increase coverage by 34.99%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           master    #1624       +/-   ##
===========================================
+ Coverage   15.61%   50.60%   +34.99%     
===========================================
  Files         151      292      +141     
  Lines       15219    26707    +11488     
===========================================
+ Hits         2376    13515    +11139     
+ Misses      12326    11160     -1166     
- Partials      517     2032     +1515     

Flag	Coverage Δ
cluster	43.82% <50.00%> (?)
dm	26.18% <50.00%> (?)
integrate	50.60% <50.00%> (+34.99%)	⬆️
playground	13.37% <ø> (?)
tiup	15.61% <ø> (ø)
unittest	∅ <ø> (∅)

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

Impacted Files	Coverage Δ
pkg/cluster/task/step.go	74.40% <50.00%> (ø)
pkg/cluster/task/download.go	81.81% <0.00%> (ø)
pkg/cluster/manager/cleanup.go	48.05% <0.00%> (ø)
components/cluster/command/scale_in.go	91.66% <0.00%> (ø)
pkg/cluster/task/backup_component.go	52.94% <0.00%> (ø)
components/cluster/command/disable.go	75.00% <0.00%> (ø)
pkg/base52/base52.go	87.50% <0.00%> (ø)
pkg/cluster/manager/manager.go	77.41% <0.00%> (ø)
components/cluster/command/rename.go	73.33% <0.00%> (ø)
... and 235 more

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