fix: copy empty file from git

[scolladon]

Explain your changes

---

Update readPathFromGit and copyFiles so it can treat empty content like real content of a file

Does this close any currently open issues?

---

closes #546

• Jest test added to check the fix is applied.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (afc0d9f) 100.00% compared to head (4a55e3f) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #547   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines          843       848    +5     
=========================================
+ Hits           843       848    +5     

Impacted Files	Coverage Δ
src/utils/childProcessUtils.js	100.00% <100.00%> (ø)
src/utils/cliHelper.js	100.00% <100.00%> (ø)
src/utils/fsHelper.js	100.00% <100.00%> (ø)

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[codeclimate]

Code Climate has analyzed commit 4a55e3f and detected 0 issues on this pull request.

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[github-actions]

Shipped in release v5.16.0.
You can install the new version using the version number or the latest-rc channel

$ sfdx plugins:install sfdx-git-delta@latest-rc
$ sfdx plugins:install [email protected]