Git default HEAD not pointing to master causes inability to do a snapshot or release

[11xor6]

If you have a repository that you clone who's HEAD points to a different branch than master (on initial clone) you can not do a release or snapshot until the master branch is checked out.

Theoretical reproduction:
$ git clone {git repo} foo
$ cd foo
$ git checkout config-branch
$ asconfig snapshot
Exception in thread "main" java.lang.NullPointerException
at io.airlift.airship.configbundler.Model.readMetadata(Model.java:60)
at io.airlift.airship.configbundler.SnapshotCommand.call(SnapshotCommand.java:35)
at io.airlift.airship.configbundler.SnapshotCommand.call(SnapshotCommand.java:21)
at io.airlift.airship.configbundler.ConfigBundler.main(ConfigBundler.java:31)

This problem goes away after you checkout the master branch.