Display warning with missing covariates

[azimov]

@gowthamrao please confirm if these are the correct required covariates, if there are more etc

[codecov[bot]]

Codecov Report

Merging #991 (213978d) into develop (d4d0ba4) will decrease coverage by 0.09%. The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           develop     #991      +/-   ##
===========================================
- Coverage    87.28%   87.18%   -0.10%     
===========================================
  Files           19       19              
  Lines         3885     3903      +18     
===========================================
+ Hits          3391     3403      +12     
- Misses         494      500       +6     

Impacted Files	Coverage Δ
R/RunDiagnostics.R	89.73% <75.00%> (-0.68%)	:arrow_down:

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