fix: revent warning when haven't names

Signed-off-by: Vitor Mattos <vitor@php.rio>

Author: vitormattos

lib/Controller/AdminController.php

@@ -125,11 +125,13 @@ private function generateCertificate(
 		array $properties = [],
 	): AEngineHandler {
 		$names = [];
-		foreach ($rootCert['names'] as $item) {
-			if (empty($item['id'])) {
-				throw new LibresignException('Parameter id is required!', 400);
+		if (isset($rootCert['names'])) {
+			foreach ($rootCert['names'] as $item) {
+				if (empty($item['id'])) {
+					throw new LibresignException('Parameter id is required!', 400);
+				}
+				$names[$item['id']]['value'] = $this->trimAndThrowIfEmpty($item['id'], $item['value']);
 			}
-			$names[$item['id']]['value'] = $this->trimAndThrowIfEmpty($item['id'], $item['value']);
 		}
 		$this->installService->generate(
 			$this->trimAndThrowIfEmpty('commonName', $rootCert['commonName']),