fix(directives): restore Chart.lock on no changes

[hiddeco]

Fixes: #2226

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[codecov]

Codecov Report

Attention: Patch coverage is 50.81967% with 30 lines in your changes missing coverage. Please review.

Project coverage is 51.07%. Comparing base (c21c4cf) to head (77f2ace).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/directives/helm_chart_updater.go	50.81%	23 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2599      +/-   ##
==========================================
- Coverage   51.09%   51.07%   -0.03%     
==========================================
  Files         282      282              
  Lines       20950    21010      +60     
==========================================
+ Hits        10705    10731      +26     
- Misses       9580     9605      +25     
- Partials      665      674       +9     

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