Add check for if google_sudoers file is empty

[cjd]

Additional test added to existing test for missing file so can handle additional potential failure mode

[codecov]

Codecov Report

Merging #762 into master will decrease coverage by 0.04%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
- Coverage   97.76%   97.72%   -0.05%     
==========================================
  Files          62       62              
  Lines        4527     4532       +5     
  Branches      232      233       +1     
==========================================
+ Hits         4426     4429       +3     
- Misses         86       88       +2     
  Partials       15       15

Impacted Files	Coverage Δ
...e/google_compute_engine/accounts/accounts_utils.py	97.95% <60%> (-1%)	⬇️

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[codecov]

Codecov Report

Merging #762 into master will decrease coverage by 0.04%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
- Coverage   97.76%   97.72%   -0.05%     
==========================================
  Files          62       62              
  Lines        4527     4532       +5     
  Branches      232      233       +1     
==========================================
+ Hits         4426     4429       +3     
- Misses         86       88       +2     
  Partials       15       15

Impacted Files	Coverage Δ
...e/google_compute_engine/accounts/accounts_utils.py	97.95% <60%> (-1%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 53ea8cd...11a7bf9. Read the comment docs.

[hopkiw]

this codebase is deprecated, but this behavior is fixed in the new guest agent