message: Found a mistake in the code that was overlooked after NAS2D's Exception class was dropped in favor of std::runtime_error.
diff: @@ -39,7 +39,7 @@ static bool validConnection(Structure* src, Structure* dst, Direction _d)
  if (src == nullptr || dst == nullptr)
  {
  #ifdef DEBUG
  - throw Exception(0, "GraphWalker NULL Pointer", "GraphWalker::validConnection() was passed a NULL Pointer.");
  + throw std::runtime_error("GraphWalker::validConnection() was passed a NULL Pointer.");
  #endif
  return false;
  }
  