Merge branch '2.3' into 2.7

* 2.3:
  Typo fix
  [2.3] Static Code Analysis for Components
  Added support \IteratorAggregate for UniqueEntityValidator
  Fix #17306 Paths with % in it are note allowed (like urlencoded)
  Added sort order SORT_STRING for params in UriSigner
  Remove normalizer cache in Serializer class

Author: fabpot

Firewall/DigestAuthenticationListener.php

@@ -171,10 +171,8 @@ public function validateAndDecode($entryPointKey, $expectedRealm)
             throw new BadCredentialsException(sprintf('Missing mandatory digest value; received header "%s" (%s)', $this->header, implode(', ', $keys)));
         }
 
-        if ('auth' === $this->elements['qop']) {
-            if (!isset($this->elements['nc']) || !isset($this->elements['cnonce'])) {
-                throw new BadCredentialsException(sprintf('Missing mandatory digest value; received header "%s"', $this->header));
-            }
+        if ('auth' === $this->elements['qop'] && !isset($this->elements['nc'], $this->elements['cnonce'])) {
+            throw new BadCredentialsException(sprintf('Missing mandatory digest value; received header "%s"', $this->header));
         }
 
         if ($expectedRealm !== $this->elements['realm']) {