Email should not be mandatory according to the form text

templates/error.twig

@@ -42,7 +42,7 @@
         <form action="{{ errorReportAddress }}" class="pure-form" method="post">
             <p>{{ '{errors:report_text}' | trans }}</p>
             <label for="email">{{ '{errors:report_email}' | trans }}</label>
-                <input type="email" name="email" id="email" class="edge" value="{{ email }}" />
+                <input type="email" name="email" id="email" class="edge" size="50" value="{{ email }}">
 
             <textarea class="text-area edge" name="text" rows="6" cols="50" placeholder="{{ '{errors:report_explain}' | trans }}" required></textarea>
         <p class="center">

www/errorreport.php

@@ -51,7 +51,9 @@ $data['directory'] = dirname(dirname(__FILE__));
 if ($config->getBoolean('errorreporting', true)) {
     $mail = new SimpleSAML\Utils\EMail('SimpleSAMLphp error report from ' . $email);
     $mail->setData($data);
-    $mail->addReplyTo($email);
+    if ($email) {
+        $mail->addReplyTo($email);
+    }
     $mail->setText($text);
     $mail->send();
     SimpleSAML\Logger::error('Report with id ' . $reportId . ' sent');