Error checking normality for t.test

[strengejacke]

Fixes #689

[codecov]

Codecov Report

Attention: Patch coverage is 34.37500% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 57.54%. Comparing base (e85e53a) to head (ef28756).

Files	Patch %	Lines
R/check_htest.R	34.37%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #690      +/-   ##
==========================================
+ Coverage   56.64%   57.54%   +0.90%     
==========================================
  Files          84       84              
  Lines        6039     6047       +8     
==========================================
+ Hits         3421     3480      +59     
+ Misses       2618     2567      -51     

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