small fixes

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

lib/Interfaces/Object/DocumentInterface.php

@@ -101,7 +101,7 @@ class DocumentInterface implements IActivityPubInterface {
 	 */
 	public function save(ACore $item) {
 		/** @var Document $item */
-		if ($item->getParent()) {
+		if (!$item->isRoot()) {
 			$item->setParentId(
 				$item->getParent()
 					 ->getId()

lib/Service/CurlService.php

@@ -103,7 +103,7 @@ class CurlService {
 
 		// we consider an account is like an email
 		if (!filter_var($account, FILTER_VALIDATE_EMAIL)) {
-			throw new InvalidResourceException();
+			throw new InvalidResourceException('account format is not valid');
 		}
 
 		list($username, $host) = explode('@', $account);