feat: fixed MergeReports fuzzer.

[yashugarg]

@terriko, protobuf now uses default values for message fields, if not provided in the fuzzed data.
This should help make the MergeReport fuzzer run!

[codecov-commenter]

Codecov Report

Merging #1898 (5d6b6b0) into main (3354d63) will decrease coverage by 1.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1898      +/-   ##
==========================================
- Coverage   89.54%   88.33%   -1.22%     
==========================================
  Files         316      316              
  Lines        7224     7224              
  Branches     1176     1176              
==========================================
- Hits         6469     6381      -88     
- Misses        490      586      +96     
+ Partials      265      257       -8     

Flag	Coverage Δ
longtests	78.73% <ø> (+0.01%)	⬆️
win-longtests	87.30% <ø> (-1.24%)	⬇️

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Impacted Files	Coverage Δ
cve_bin_tool/nvd_api.py	24.00% <0.00%> (-52.80%)	⬇️
test/test_nvd_api.py	50.87% <0.00%> (-40.36%)	⬇️
cve_bin_tool/cli.py	77.03% <0.00%> (+0.37%)	⬆️

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[terriko]

Awesome! Glad you got something figured out for this problem.

I did run the fuzz_tuples.py over the weekend and got no new results, which was kind of expected but still probably good news! I'll try switching it over to fuzz_intermediate_report_merge.py today if the machine I'm using is still free for a few days.