Some "inherited" rights might be missing if no spaces permissions are found

A bad early return causes this.

In practice, this should almost never happens as it is very uncommon (not sure it happens at all actually) not to have space permissions but to have page permissions set.

(reported by awe at https://jira.xwiki.org/browse/CONFLUENCE-543?focusedId=123429&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-123429)