Check if entry is not NULL
Examples
not.null("") # TRUE
#> [1] TRUE
not.null(NULL) # FALSE
#> [1] FALSE
if(not.null(45)) message("something") # yes
#> something
Check if entry is not NULL
not.null("") # TRUE
#> [1] TRUE
not.null(NULL) # FALSE
#> [1] FALSE
if(not.null(45)) message("something") # yes
#> something