Merge branch '3.4' into 4.1

* 3.4:
  fix cs
  SCA: consolidate non empty array checks across codebase
  [cs] correct invalid @param types
  [Bridge/PhpUnit] Use composer to download phpunit
  [DI] fix taking lazy services into account when dumping the container
  [Form] Fixed empty data for compound date interval
  [Cache] fix optimizing Psr6Cache for AdapterInterface pools
  deal with explicitly enabled workflow nodes

Author: nicolas-grekas

Constraint.php

@@ -120,7 +120,7 @@ public function __construct($options = null)
         if (\is_array($options)) {
             reset($options);
         }
-        if (\is_array($options) && \count($options) > 0 && \is_string(key($options))) {
+        if ($options && \is_array($options) && \is_string(key($options))) {
             foreach ($options as $option => $value) {
                 if (array_key_exists($option, $knownOptions)) {
                     $this->$option = $value;