rpdata-server: Fixed unhelpful error message being returned on panic.

cmd/rpdata-server/main.go

@@ -75,11 +75,10 @@ func queryHandler() http.HandlerFunc {
 	handler := handler.GraphQL(
 		graph2.New(),
 		handler.RecoverFunc(func(ctx context.Context, err interface{}) error {
-			// send this panic somewhere
 			log.Println(err)
 			log.Println(string(debug.Stack()))
 
-			return fmt.Errorf("shit")
+			return fmt.Errorf("The server failed to serve your request due to an internal error, it has been logged")
 		}),
 	)