RD-4923 Error out on empty daemon name (#836)
RD-4923 Error out on empty daemon name (#836)

In cloudify-cosmo/cloudify-common#1055 I've made it so that
gat_daemon_name returns None if the envvar is missing. Let's abort
then, so that we don't attempt to read None.json
cloudify-cosmo/cloudify-agent,cloudify-cosmo/cloudify-agent