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Internal function.
.allmissing(data)
FALSE if no variable(s) all missing, else an informative string message.
FALSE
A dataset to check each variable if all missing / non finite / zero character vectors
JWileymisc:::.allmissing(mtcars) cat(JWileymisc:::.allmissing(data.frame(a = NA, b = 1)), fill = TRUE)
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