fix: codegen should generate empty files

[katcipis]

Reason for This Change

We want both generate_hcl and generate_file to generate empty files when content is empty, instead of the current behavior of not generating any file.

Description of Changes

Both code generation and outdated code detection are fixed to handle empty files.

[codecov]

Codecov Report

Merging #491 (af3c89c) into main (85b23da) will increase coverage by 0.00%.
The diff coverage is 88.88%.

@@           Coverage Diff           @@
##             main     #491   +/-   ##
=======================================
  Coverage   70.16%   70.16%           
=======================================
  Files          49       49           
  Lines        8644     8645    +1     
=======================================
+ Hits         6065     6066    +1     
  Misses       2290     2290           
  Partials      289      289           

Flag	Coverage Δ
tests	70.16% <88.88%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
generate/generate.go	82.80% <88.88%> (+0.03%)	⬆️

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[i4ki]

lgtm