list-plugins doesn't work outside project directory

In grails 1.2.2, you could run grails list-plugins in any directory and obtain the list of plugins in the default repository. This is no longer the case in a fresh installation because the grailsCentral() repository is not hardcoded in the scripts.

The output in this case looks like this:

Welcome to Grails 1.3.2 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: /opt/grails-1.3.2

Base Directory: /home/luis
Resolving dependencies...
Dependencies resolved in 970ms.
Running script /opt/grails-1.3.2/scripts/ListPlugins_.groovy
Environment set to development

Plug-ins you currently have installed are listed below:
-------------------------------------------------------------

You do not have any plugins installed.

To find more info about plugin type 'grails plugin-info [NAME]'

To install type 'grails install-plugin [NAME] [VERSION]'

For further info visit http://grails.org/Plugins