Merge branch '6.4' into 7.0

* 6.4:
  [AssetMapper] Handle assets with non-ascii characters in dev server
  [Translation] Fix `TranslationNodeVisitor` with constant domain
  CS fix
  [Routing] Remove `@final` annotation from `Route` attribute
  [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`
  grab a service from the container only if it exists
  [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

Command/CachePoolClearCommand.php

@@ -72,7 +72,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
         $poolNames = $input->getArgument('pools');
         $excludedPoolNames = $input->getOption('exclude');
-        if ($input->getOption('all')) {
+        if ($clearAll = $input->getOption('all')) {
             if (!$this->poolNames) {
                 throw new InvalidArgumentException('Could not clear all cache pools, try specifying a specific pool or cache clearer.');
             }
@@ -91,7 +91,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         foreach ($poolNames as $id) {
             if ($this->poolClearer->hasPool($id)) {
                 $pools[$id] = $id;
-            } else {
+            } elseif (!$clearAll || $kernel->getContainer()->has($id)) {
                 $pool = $kernel->getContainer()->get($id);
 
                 if ($pool instanceof CacheItemPoolInterface) {