validateSettings() sometimes returns NA value for "valid"

[bzkrouse]

Seems to be coming from checkNumericColumns()

[jwildfire]

Assuming this is the latest v0.8 build, I'll address this as part of #118

[jwildfire]

@bzkrouse Any chance you can give me code (or steps) to reproduce this behaviour?

[bzkrouse]

settingsl <- list(visitn_col = "VISITNUM")
safetyGraphics:::checkNumericColumns(list("visitn_col"), settingsl, mtcars)