Allow omitted config for nested class in ProxyFilter

Author: melanger

CHANGELOG.md

@@ -2,6 +2,8 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
+#### Fixed
+- Allow omitted config for nested class in ProxyFilter
 
 ## [v3.7.1]
 #### Fixed

lib/Auth/Process/ProxyFilter.php

@@ -48,7 +48,7 @@ public function __construct($config, $reserved)
         parent::__construct($config, $reserved);
 
         $conf = Configuration::loadFromArray($config);
-        $this->config = $conf->getArray('config');
+        $this->config = $conf->getArray('config', []);
         $this->nestedClass = Configuration::loadFromArray($this->config)->getString('class');
         unset($this->config['class']);
         $this->filterSPs = $conf->getArray('filterSPs', []);