worker: fix nil pointer in refreshCache

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Base: 70.59% // Head: 70.59% // No change to project coverage 👍

Coverage data is based on head (39739ed) compared to base (762f21f).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 39739ed differs from pull request most recent head 293f417. Consider uploading reports for the commit 293f417 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #611   +/-   ##
=======================================
  Coverage   70.59%   70.59%           
=======================================
  Files          63       63           
  Lines       12400    12400           
=======================================
  Hits         8754     8754           
  Misses       2818     2818           
  Partials      828      828           

Impacted Files	Coverage Δ
worker/worker.go	66.47% <100.00%> (ø)

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