add error detail, fixes #2814

Closes #2814

Merge request studip/studip!1896

lib/classes/JsonApi/Errors/ErrorHandler.php

@@ -85,7 +85,7 @@ class ErrorHandler
             $errors = $this->createErrorCollection(
                 '500',
                 $exception->getMessage(),
-                null,
+                $exception->getFile() . '(' . $exception->getLine() . ')',
                 $exception,
                 $displayErrorDetails
             );