fix(coordinator): get empty task

[colinlyguo]

Purpose or design rationale of this PR

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• fix: A bug fix

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.31%. Comparing base (eada1d0) to head (83c4f59).
Report is 1 commits behind head on develop.

❗ Current head 83c4f59 differs from pull request most recent head bcf4c6f

Please upload reports for the commit bcf4c6f to get more accurate results.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1406   +/-   ##
========================================
  Coverage    54.31%   54.31%           
========================================
  Files          156      156           
  Lines        11918    11918           
========================================
  Hits          6473     6473           
  Misses        4950     4950           
  Partials       495      495           

Flag	Coverage Δ
coordinator	19.93% <ø> (ø)

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