Do not error on deprecated methods for now

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Db/AssignmentMapper.php

@@ -91,7 +91,7 @@ class AssignmentMapper extends QBMapper implements IPermissionMapper {
 	 * Check if user exists before assigning it to a card
 	 *
 	 * @param Entity $entity
-	 * @return null|Assignment
+	 * @return Assignment
 	 * @throws NotFoundException
 	 */
 	public function insert(Entity $entity): Entity {

lib/Db/StackMapper.php

@@ -39,9 +39,8 @@ class StackMapper extends DeckMapper implements IPermissionMapper {
 
 	/**
 	 * @param $id
-	 * @return \OCP\AppFramework\Db\Entity if not found
-	 * @throws \OCP\AppFramework\Db\MultipleObjectsReturnedException
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException
+	 * @throws MultipleObjectsReturnedException
+	 * @throws DoesNotExistException
 	 */
 	public function find($id): Stack {
 		$sql = 'SELECT * FROM `*PREFIX*deck_stacks` ' .