Merge branch '6572-$issued_successfully' into 'develop'

Undefined variable $issued_successfully

Closes #6572

See merge request ispconfig/ispconfig3!1801

Author: Till Brehm

install/lib/installer_base.lib.php

@@ -3051,6 +3051,8 @@ public function make_ispconfig_ssl_cert() {
 			$crt_issuer = exec("openssl x509 -in ".escapeshellarg($ssl_crt_file)." -inform PEM -noout -issuer");
 		}
 
+		$issued_successfully = false;
+
 		if ((@file_exists($ssl_crt_file) && ($crt_subject == $crt_issuer)) || (!@is_dir($acme_cert_dir) || !@file_exists($check_acme_file) || !@file_exists($ssl_crt_file) || md5_file($check_acme_file) != md5_file($ssl_crt_file)) && $ip_address_match == true) {
 
 			// This script is needed earlier to check and open http port 80 or standalone might fail
@@ -3149,8 +3151,6 @@ public function make_ispconfig_ssl_cert() {
 				}
 			}
 
-			$issued_successfully = false;
-
 			// Backup existing ispserver ssl files
 			//
 			// We may find valid or broken symlinks or actual files here.