safeTensorsMergeProcessor used to early-return whenever it was handed a
non-nil error. Returning early left them nameless, and
missing-name compliance then silently dropped them, so a single unparseable
file could erase every otherwise-valid model from the SBOM. The processor
now always names/drops and propagates the error instead.
Signed-off-by: Christopher Phillips <32073428+spiffcs@users.noreply.github.com>