Is an object the empty coding?
is_empty_coding(x)
An object
TRUE/FALSE if the object is identical to `empty_coding()`
is_empty_coding(empty_coding())
#> [1] TRUE
is_empty_coding(coding())
#> [1] TRUE
is_empty_coding(coding(code("Yes", 1), code("No", 0)))
#> [1] FALSE