delta-generation is broken in 0.6.0+
Delta-generation jobs fail silently at least since 0.6.0. The generation fails but the job does not exit with an error. The error message is, that the newly build commit does not have a parent commit.
I suspect that we currently produce broken commit relations. In deployments I'm currently not able deploy specific commits since rpm-ostree states that the selected commit is not part of the remote which at least in theory is not true.
This may be related to #73