Rename $contacts to $has_contacts, it missed this commit: 7cb74a0

apps/contacts/index.php

@@ -15,7 +15,7 @@ OCP\App::checkAppEnabled('contacts');
 // Get active address books. This creates a default one if none exists.
 $ids = OC_Contacts_Addressbook::activeIds(OCP\USER::getUser());
 $has_contacts = (count(OC_Contacts_VCard::all($ids, 0, 1)) > 0 ? true : false); // just to check if there are any contacts.
-if($contacts === false) {
+if($has_contacts === false) {
 	OCP\Util::writeLog('contacts','index.html: No contacts found.',OCP\Util::DEBUG);
 }