message: Allow unnamed-package classes in ProguardMap
  Summary:
  Extend filename guessing to classes in the unnamed package.
  Github issue
diff: @@ -350,9 +350,13 @@ DexString* file_name_from_method_string(const DexString* method) {
  if (innercls_pos != std::string::npos) {
  end = innercls_pos;
  }
  + always_assert(end != std::string::npos);
  auto start = s.rfind("/", end);
  - always_assert(start != std::string::npos && end != std::string::npos);
  + if (start != std::string::npos) {
  ++start; // Skip over the "/"
  + } else {
  + start = 1; // Skip over the "L"
  + }
  return DexString::make_string(s.substr(start, end - start) + ".java");
  }
  