#' @export
`%||%` <- function (x, y)
{
if (is.empty(x))
return(y)
else if (is.null(x) || is.na(x))
return(y)
else if( class(x)=="character" && nchar(x)==0 )
return(y)
else x
}
#' @export
is.empty <- function(x){
# !is.null(x)
!as.logical(length(x))
}
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