From a21c0f9c16f0fc557568714fbe1b6856ab25388d Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Sun, 25 Oct 2020 20:10:09 +0000
Subject: [PATCH] Groundnet parsing: Fix exception for missing value

Sentry-Id: FLIGHTGEAR-CJ
---
 src/Airports/dynamicloader.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Airports/dynamicloader.cxx b/src/Airports/dynamicloader.cxx
index 0e5e35203..3f3c37d0a 100644
--- a/src/Airports/dynamicloader.cxx
+++ b/src/Airports/dynamicloader.cxx
@@ -123,7 +123,7 @@ void FGGroundNetXMLLoader::startParking(const XMLAttributes &atts)
     else if (attname == "pushBackRoute") {
       const string attrVal = atts.getValue(i);
       try {
-          if (attrVal == "None") {
+          if (attrVal.empty() || (attrVal == "None")) {
               pushBackRoute = -2;
           } else {
               pushBackRoute = simgear::strutils::readNonNegativeInt<int>(attrVal);