Undefined links should stop project from creation
Undefined links should stop project from creation

In docker-compose, if an undefined link is provided to service.
It is not created. Similar behaviour should be for libcompose.

Signed-off-by: Kunal Kushwaha <435eaf3591fb6cb240ad07f6a9dbe8ce50f376c2@gmail.com>

dweomer/docker-libcompose,vdemeester/libcompose,Azure22/libcompose,dweomer/docker-libcompose,weitenghuang/libcompose,vito-c/libcompose,weitenghuang/libcompose,jainvipin/libcompose,docker/libcompose,jainvipin/libcompose,Azure22/libcompose,vito-c/libcompose,docker/libcompose,vdemeester/libcompose