fix(ShareApiClients): Maintain meaning of `''` and null for share api clients

Signed-off-by: fenn-cs <fenn25.fn@gmail.com>

apps/files_sharing/lib/Controller/ShareAPIController.php

@@ -775,19 +775,19 @@ class ShareAPIController extends OCSController {
 			$share->setPermissions($permissions);
 		} elseif ($shareType === IShare::TYPE_ROOM) {
 			try {
-				$this->getRoomShareHelper()->createShare($share, $shareWith, $permissions, $expireDate);
+				$this->getRoomShareHelper()->createShare($share, $shareWith, $permissions, $expireDate ?? '');
 			} catch (QueryException $e) {
 				throw new OCSForbiddenException($this->l->t('Sharing %s failed because the back end does not support room shares', [$node->getPath()]));
 			}
 		} elseif ($shareType === IShare::TYPE_DECK) {
 			try {
-				$this->getDeckShareHelper()->createShare($share, $shareWith, $permissions, $expireDate);
+				$this->getDeckShareHelper()->createShare($share, $shareWith, $permissions, $expireDate ?? '');
 			} catch (QueryException $e) {
 				throw new OCSForbiddenException($this->l->t('Sharing %s failed because the back end does not support room shares', [$node->getPath()]));
 			}
 		} elseif ($shareType === IShare::TYPE_SCIENCEMESH) {
 			try {
-				$this->getSciencemeshShareHelper()->createShare($share, $shareWith, $permissions, $expireDate);
+				$this->getSciencemeshShareHelper()->createShare($share, $shareWith, $permissions, $expireDate ?? '');
 			} catch (QueryException $e) {
 				throw new OCSForbiddenException($this->l->t('Sharing %s failed because the back end does not support ScienceMesh shares', [$node->getPath()]));
 			}