show exception type in debug mode

core/templates/exception.php

@@ -16,6 +16,7 @@ style('core', ['styles', 'header']);
 		<li><?php p($l->t('Remote Address: %s', $_['remoteAddr'])) ?></li>
 		<li><?php p($l->t('Request ID: %s', $_['requestID'])) ?></li>
 		<?php if($_['debugMode']): ?>
+			<li><?php p($l->t('Type: %s', $_['errorClass'])) ?></li>
 			<li><?php p($l->t('Code: %s', $_['errorCode'])) ?></li>
 			<li><?php p($l->t('Message: %s', $_['errorMsg'])) ?></li>
 			<li><?php p($l->t('File: %s', $_['file'])) ?></li>

lib/private/template.php

@@ -217,6 +217,7 @@ class OC_Template extends \OC\Template\Base {
 	public static function printExceptionErrorPage(Exception $exception) {
 		$request = \OC::$server->getRequest();
 		$content = new \OC_Template('', 'exception', 'error', false);
+		$content->assign('errorClass', get_class($exception));
 		$content->assign('errorMsg', $exception->getMessage());
 		$content->assign('errorCode', $exception->getCode());
 		$content->assign('file', $exception->getFile());