Fix pygrep hook env health check

[j178]

For #918

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.07%. Comparing base (f13e392) to head (e4400af).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
+ Coverage   90.06%   90.07%   +0.01%     
==========================================
  Files          64       64              
  Lines       11950    11944       -6     
==========================================
- Hits        10763    10759       -4     
+ Misses       1187     1185       -2     

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