fix(helm): cache empty index file

[yz89122]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 451cf52

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@kosko/helm	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.73%. Comparing base (94e94f2) to head (2292a30).
Report is 3 commits behind head on master.

❗ Current head 2292a30 differs from pull request most recent head 451cf52

Please upload reports for the commit 451cf52 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   96.73%   96.73%           
=======================================
  Files         126      126           
  Lines        2998     2999    +1     
  Branches      774      753   -21     
=======================================
+ Hits         2900     2901    +1     
  Misses         97       97           
  Partials        1        1           

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