FunctionHandler fails to handle unexpected routes

[Ubiguchi]

StockTraderAPI.Program.FunctionHandler handles /price/ and /history/, but doesn't have a default switch case for handling unexpected routes, resulting in it returning a null.

Might it make sense to add a catch-all for any other routes and then return a well-formatted API response, along these lines:

       default:
            response = await _getStockEndpoints.GetInvalidRoute(request.PathParameters["stockSymbol"]);
            break;