Fix a couple warnings in beta

* Notice: Undefined index: wpSave in /srv/common-local/wmf-config/CommonSettings.php on line 950
* Warning: Creating default object from empty value in /srv/common-local/wmf-config/filebackend-labs.php on line 13

Change-Id: I00bfea1530ef01009474161a7e1da5053278f149