Race condition in config-changed hook

[Charles Butler]

What I did: Added administrators to the charm via juju set admins="foo:bar"

What I expected: To have administrators populated in mediawiki, without error

what happened:

The charm assumes there is a MySQL database relationship defined (When LocalSettings.php is generated) in config-changed. This bug rears its head when you attempt to add administrators to MediaWiki without having a MySQL database relationship defined.

relevant lines:
 for admin in $admins ; do
        user=`echo $admin | cut -d: -f1`
        pass=`echo $admin | cut -d: -f2`
        output=`php createAndPromote.php --conf /etc/mediawiki/LocalSettings.php $user $pass`
        if [ ! "$output" = "account exists." ] ; then
            echo $output
            exit 1
        fi

Proposed fix:
http://bazaar.launchpad.net/~lazypower/charms/precise/mediawiki/tests/revision/74 contains an ammendment to the config-changed hook