No handlers could be found for logger "root"

``python setup.py sdist`` is failing on Jenkins:

https://jenkins.shiningpanda-ci.com/astropy/job/astropy-master-sdist/511/console

The error is:

```
hard linking scripts/volint -> astropy-0.3.dev3744/scripts
Creating tar archive
removing 'astropy-0.3.dev3744' (and everything under it)
+ /home/slave/env2.7-numpy1.6.1/bin/python -c import astropy.version; import sys; sys.stdout.write(astropy.version.version)
No handlers could be found for logger "root"
+ ASTROPY_VERSION=
Build step 'Execute shell' marked build as failure
Finished: FAILURE
```