image: do not block null image loading in the elm layer
image: do not block null image loading in the elm layer

this is handled correctly in evas. checking load errors from
the engine/loaders is sufficient, but the printed ERR messages
for these cases have been improved

partially reverts 865383aa0da5d1eb6d29f4ed5447a73f63800a33
reverts ee7d5425628942a45e23a2cb6be253db8ec0b3fd
ref 840dcc618ead292414b0de64a7a3ae38d778311f
ref a915229dc87606472480a8b2eacce9514055ac27

fix Titalia

rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary