add handling of lossy only workers to "optimizes at least one test image" spec
add handling of lossy only workers to "optimizes at least one test image" spec

weheartit/image_optim,weheartit/image_optim,ramiroaraujo/image_optim,weheartit/image_optim,ramiroaraujo/image_optim,toy/image_optim,mihailim/image_optim,toy/image_optim,mihailim/image_optim,toy/image_optim,ramiroaraujo/image_optim,mihailim/image_optim