Do not synchronize package.json if symfony/flex is not installed

Author: leofeyer

src/Flex.php

@@ -502,6 +502,12 @@ public function finish(string $rootDir, ?string $originalComposerJsonHash = null
 
     private function synchronizePackageJson(string $rootDir)
     {
+        if (!$this->downloader->isEnabled()) {
+            $this->io->writeError('<warning>Synchronizing package.json is disabled: "symfony/flex" not found in the root composer.json</>');
+
+            return;
+        }
+
         $rootDir = realpath($rootDir);
         $vendorDir = trim((new Filesystem())->makePathRelative($this->config->get('vendor-dir'), $rootDir), '/');