Revert enforcing of client redirect uri

Author: Sephster

src/Grant/AbstractGrant.php

@@ -216,7 +216,7 @@ protected function getClientEntityOrFail($clientId, ServerRequestInterface $requ
     {
         $client = $this->clientRepository->getClientEntity($clientId);
 
-        if ($client instanceof ClientEntityInterface === false || empty($client->getRedirectUri())) {
+        if ($client instanceof ClientEntityInterface === false) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
             throw OAuthServerException::invalidClient($request);
         }

src/Grant/AuthCodeGrant.php

@@ -261,7 +261,8 @@ public function validateAuthorizationRequest(ServerRequestInterface $request)
 
         if ($redirectUri !== null) {
             $this->validateRedirectUri($redirectUri, $client, $request);
-        } elseif (\is_array($client->getRedirectUri()) && \count($client->getRedirectUri()) !== 1) {
+        } elseif (empty($client->getRedirectUri()) ||
+            (\is_array($client->getRedirectUri()) && \count($client->getRedirectUri()) !== 1)) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
 
             throw OAuthServerException::invalidClient($request);