Restore SimpleServerError method

@@ -262,6 +262,10 @@ func InternalServerError(rw http.ResponseWriter, r *http.Request) {
 	t.Execute(rw, data)
 }
 
+func SimpleServerError(rw http.ResponseWriter, r *http.Request) {
+	http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+}
+
 func Errorhandler(err string, h http.HandlerFunc) {
 	ErrorMaps[err] = h
 }