Merge branch '5.4' into 6.3

* 5.4:
  [Translation] Fix `TranslationNodeVisitor` with constant domain
  [Messenger] [AMQP] Throw exception on `nack` callback
  [Validator] revise Latvian translations
  [ErrorHandler] Fix `RecursiveDirectoryIterator` exception with wrong composer autoload
  [HttpFoundation] Request without content-type or content-length header should result in null values, not empty strings
  [Cache] Fix possible infinite loop in `CachePoolPass`
  [Mime] Fix undefined array key 0 when empty sender
  [Console] Allow '0' as a $shortcut in InputOption.php
  fix multi-byte code area to convert
  [Validator] Make it explicit when English translation differs from its resource name

Author: nicolas-grekas

ServerBag.php

@@ -29,7 +29,7 @@ public function getHeaders(): array
         foreach ($this->parameters as $key => $value) {
             if (str_starts_with($key, 'HTTP_')) {
                 $headers[substr($key, 5)] = $value;
-            } elseif (\in_array($key, ['CONTENT_TYPE', 'CONTENT_LENGTH', 'CONTENT_MD5'], true)) {
+            } elseif (\in_array($key, ['CONTENT_TYPE', 'CONTENT_LENGTH', 'CONTENT_MD5'], true) && '' !== $value) {
                 $headers[$key] = $value;
             }
         }

Tests/ServerBagTest.php

@@ -177,4 +177,20 @@ public function testItDoesNotOverwriteTheAuthorizationHeaderIfItIsAlreadySet()
             'PHP_AUTH_PW' => '',
         ], $bag->getHeaders());
     }
+
+    /**
+     * An HTTP request without content-type and content-length will result in
+     * the variables $_SERVER['CONTENT_TYPE'] and $_SERVER['CONTENT_LENGTH']
+     * containing an empty string in PHP.
+     */
+    public function testRequestWithoutContentTypeAndContentLength()
+    {
+        $bag = new ServerBag([
+            'CONTENT_TYPE' => '',
+            'CONTENT_LENGTH' => '',
+            'HTTP_USER_AGENT' => 'foo',
+        ]);
+
+        $this->assertSame(['USER_AGENT' => 'foo'], $bag->getHeaders());
+    }
 }