message: Add error message to verilo_pp in case provided file is not found
diff: @@ -88,6 +88,11 @@ Context * Convertor::parse(std::vector<std::string> _fileNames, Langue _lang,
  std::string Convertor::verilog_pp(const std::string fileName,
  std::vector<std::string> incdir,unsigned int mode) {
  + struct stat buffer;
  + if (stat(fileName.c_str(), &buffer) != 0) {
  + throw parseException(fileName + " does not exist.");
  + }
  +
  std::ifstream t(fileName);
  std::string str((std::istreambuf_iterator<char>(t)),
  std::istreambuf_iterator<char>());
  