Bug 4450 Use more consistent error returns in C4/Creators/*

Bug 4450 Use more consistent error returns in C4/Creators/*

A lot of routines were defaulting to return -1 in error conditions
but calling code was expecting a ref or object
use return with explicit undef (or emptyness in array context)
for these cases. Extended this to cases where return was not tested
( -1 might in some cases be legit data).

Signed-off-by: Chris Nighswonger <cnighswonger@foundations.edu>
Signed-off-by: Galen Charlton <gmcharlt@gmail.com>
(cherry picked from commit 5cf2b78b6ffa401bc82b3f913c89828c38b8e4ed)
[RM note: ... thereby undoing the revert]