first_non_empty

[ittaiz]

See if we can replace first_non_empty with code from skylib (existing or to contribute back).
Motivation for generalization- Recurring pattern of target attribute and if not fallback to toolchain definition

[borkaehw]

The code is simple but I don't get the use case of it

# Return the first non-empty arg. If all are empty, return the last.
def first_non_empty(*args):
    for arg in args:
        if arg:
            return arg
    return args[-1]

What inputs do you expect here?

[ittaiz]

I wrote it in the motivation above: Recurring pattern of target attribute and if not fallback to toolchain definition. This is how we use it.