docker run without environment variables fails.

[spameier]

The following error appears when not setting any environment variables:

host:~$ sudo docker run -p 8000:8000 moul/icecast
HOSTNAME=0db942a3e23d
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
DEBIAN_FRONTEND=noninteractive
PWD=/
+ set_val source-password
+ [ -n  ]
+ echo ERROR: setting for 'source-password' is missing!
ERROR: setting for 'source-password' is missing!
+ exit

This is due to PR #5 where the functions exits instead of doing nothing when no environment var is set.

[EdwardEisenhauer]

I have the same problem, I would like to run an image with my own config file (via ADD ./icecast.xml /etc/icecast2).