"new variables" throw warning when action is saved

hi,

warning: Invalid argument supplied for foreach() in /usr/share/apache2/drupal/sites/all/modules/rules/rules/rules.admin_rule_proxy.inc on line 280.

this warning is thrown if the 'new variables' key is used in hook_action_info().

to reproduce you may:

1.) introduce a rule for some event like "user page has been viewed"
2.) add an action that provides new variables like "load a user account"
3.) save it
=> boom

/markus