Bugfix: use correct variable

If response is unsigned, ensure that all assertions are signed before proceeding to process the assertions

Author: tvdijen

src/Response/Processor.php

@@ -153,8 +153,8 @@ private function processAssertions(Response $response): ArrayCollection
         );
 
         if (!$this->responseIsSigned) {
-            foreach ($assertions as $assertion) {
-                if (!$assertion->wasSignedAtConstruction()) {
+            foreach ($decryptedAssertions as $assertion) {
+                if (!$decryptedAssertions->wasSignedAtConstruction()) {
                     throw new UnsignedResponseException(
                         'Both the response and the assertion it contains are not signed.',
                     );