Avoid warning if string is empty or null

[TobiasKrais]

No description provided.

[AWqxKAWERbXo]

ErrorException: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated
File: src\addons\yrewrite\lib\yrewrite\scheme.php
Line: 121

Stacktrace

Function	File	Line
rex_error_handler::handleError
str_replace	src\addons\yrewrite\lib\yrewrite\scheme.php	121
rex_yrewrite_scheme->normalize	src\addons\url\lib\Url\Rewriter\Yrewrite.php	147
Url\Rewriter\Yrewrite->normalize	src\addons\url\lib\Url\Profile.php	323
Url\Profile->createAndSaveUrls	src\addons\url\lib\Url\Profile.php	276
Url\Profile->buildUrls	src\addons\url\lib\Url\Generator.php	33
Url\Generator->execute	src\addons\url\boot.php	42
rex_package->{closure}	src\core\lib\extension.php	52
rex_extension::{closure}	src\core\lib\util\timer.php	56
rex_timer::measure	src\core\lib\extension.php	42
rex_extension::registerPoint	src\core\functions\function_rex_other.php	34
rex_delete_cache	src\addons\install\lib\api\api_core_update.php	220
rex_api_install_core_update->execute	src\core\lib\api_function.php	202
rex_api_function::handleCall	src\core\backend.php	274
require	src\core\boot.php	157
require	public\redaxo\index.php	12

System report (REDAXO 5.19.0, PHP 8.3.16, MySQL 8.4.3)

REDAXO
Version	5.19.0

PHP
Version	8.3.16
OPcache	no
Xdebug	no

Database
Version	MySQL 8.4.3
Character set	utf8mb4

Server
OS	WINNT
SAPI	apache2handler
Webserver	Apache/2.4.62

Request
Browser	Chrome/139.0.0.0
Protocol	HTTP/1.1
HTTPS	yes

Packages
yrewrite	2.12.0

[TobiasKrais]

Ping @dergel : Spricht was gegen den PR?