Add proper message to created share not found

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

lib/private/Share20/DefaultShareProvider.php

@@ -223,7 +223,7 @@ public function create(\OCP\Share\IShare $share) {
 		$cursor->closeCursor();
 
 		if ($data === false) {
-			throw new ShareNotFound();
+			throw new ShareNotFound('Newly created share could not be found');
 		}
 
 		$mailSendValue = $share->getMailSend();