refactor: remove unneeded property check

Author: kenjis

phpstan-baseline.php

@@ -1,11 +1,6 @@
 <?php declare(strict_types = 1);
 
 $ignoreErrors = [];
-$ignoreErrors[] = [
-	'message' => '#^Call to function property_exists\\(\\) with CodeIgniter\\\\Shield\\\\Config\\\\Auth and \'userProvider\' will always evaluate to true\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/src/Auth.php',
-];
 $ignoreErrors[] = [
 	'message' => '#^Construct empty\\(\\) is not allowed\\. Use more strict comparison\\.$#',
 	'count' => 1,

src/Auth.php

@@ -153,10 +153,6 @@ public function getProvider(): UserModel
             return $this->userProvider;
         }
 
-        if (! property_exists($this->config, 'userProvider')) {
-            throw AuthenticationException::forUnknownUserProvider();
-        }
-
         $className          = $this->config->userProvider;
         $this->userProvider = new $className();