message: fix debug.traceback() return nil in lua5.1
diff: @@ -7,7 +7,12 @@ function __TS__SourceMapTraceBack(this: void, fileName: string, sourceMap: { [li
  if (globalThis.__TS__originalTraceback === undefined) {
  globalThis.__TS__originalTraceback = debug.traceback;
  debug.traceback = (thread, message, level) => {
  - const trace = globalThis.__TS__originalTraceback(thread, message, level);
  + let trace: string;
  + if (thread === undefined && message === undefined && level === undefined) {
  + trace = globalThis.__TS__originalTraceback();
  + } else {
  + trace = globalThis.__TS__originalTraceback(thread, message, level);
  + }
  if (typeof trace !== "string") {
  return trace;
  