Merge branch '4.2' into 4.3

* 4.2:
  [HttpKernel] Fix handling non-catchable fatal errors
  Fix json-encoding when JSON_THROW_ON_ERROR is used
  [HttpFoundation] work around PHP 7.3 bug related to json_encode()
  [Security] added support for updated \"distinguished name\" format in x509 authentication

Console/Descriptor/JsonDescriptor.php

@@ -94,7 +94,8 @@ protected function describeOption(OptionsResolver $optionsResolver, array $optio
 
     private function writeData(array $data, array $options)
     {
-        $flags = $options['json_encoding'] ?? 0;
+        $flags = isset($options['json_encoding']) ? $options['json_encoding'] : 0;
+
         $this->output->write(json_encode($data, $flags | JSON_PRETTY_PRINT)."\n");
     }