Simplified code.

module/VuFind/src/VuFind/Controller/MyResearchController.php

@@ -115,12 +115,10 @@ class MyResearchController extends AbstractBase
         // if the current auth class proxies others, we'll get the proxied
         //   auth method as a querystring or post parameter.
         //   Force to post.
-        $method = trim($this->params()->fromQuery('auth_method'));
-        if ($method) {
-            $this->getRequest()->setPost(
-                $this->getRequest()->getPost()->set('auth_method', $method)
-            );
+        if ($method = trim($this->params()->fromQuery('auth_method'))) {
+            $this->getRequest()->getPost()->set('auth_method', $method);
         }
+
         // Process login request, if necessary (either because a form has been
         // submitted or because we're using an external login provider):
         if ($this->params()->fromPost('processLogin')