Graph.Get function already returns nil when the image doesn't exist so
following comment is obsolete.
FIXME: return nil when the image doesn't exist, instead of an error
Signed-off-by: Daehyeok.Mun <daehyeok@gmail.com>
Upstream-commit: 59d58352dfb66a12000d4b65f6c337c7936326e3
Component: engine