"section error" configuring file system repository

Note for pre-integration testers: If you apply the individual patch without upgrading the whole site, you have to purge caches manually after applying the patch to invalidate plugin manager's internal caches. Fix test As an admin, go to Site administration > Plugins > Repositories > Manage repositories Change the mode of some repository to "Enabled but hidden" TEST: Check that you can visit the hidden repository's settings page TEST: Check that in the Clean theme, the hidden repository has its node displayed in the administration settings block. Anti-regression test As an admin, go to Site administration > Plugins > Repositories > Manage repositories Change the mode of some repository that is fully configured (e.g. it appears on the filepicker menu) to "Enabled but hidden" Go to a page with a filepicker or HTML editor available (e.g. edit your profile) TEST: Check that the hidden repository is not offered when adding a new file.