fuzzing: open writer later in fuzz utils

[AdamKorcz]

Signed-off-by: AdamKorcz adam@adalogics.com

Summary

This PR moves the opening of a zip writer later in createArtifactBytes until after createArtifactBytes has checked that there are files to zip. As such, it avoids opening a zip writer if the fuzzer does not create any files to zip.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1326 (a3b2dfd) into main (a90366e) will decrease coverage by 0.04%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #1326      +/-   ##
==========================================
- Coverage   63.40%   63.36%   -0.04%     
==========================================
  Files          82       82              
  Lines        7869     7869              
==========================================
- Hits         4989     4986       -3     
- Misses       2253     2255       +2     
- Partials      627      628       +1     

Flag	Coverage Δ
e2etests	46.88% <ø> (+0.02%)	⬆️
unittests	42.89% <ø> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
pkg/types/alpine/v0.0.1/entry.go	72.90% <0.00%> (-1.20%)	⬇️

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