From 9b79fbeb7ea43f8d9eefe94993b81558f051616c Mon Sep 17 00:00:00 2001
From: Don Gagne <dongagne@outlook.com>
Date: Thu, 2 Aug 2018 14:41:26 -0700
Subject: [PATCH] Fix failure handling

---
 src/MissionManager/VisualMissionItem.cc | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/MissionManager/VisualMissionItem.cc b/src/MissionManager/VisualMissionItem.cc
index 70ccdbc5b..0370a0653 100644
--- a/src/MissionManager/VisualMissionItem.cc
+++ b/src/MissionManager/VisualMissionItem.cc
@@ -195,9 +195,7 @@ void VisualMissionItem::_reallyUpdateTerrainAltitude(void)
 
 void VisualMissionItem::_terrainDataReceived(bool success, QList<double> heights)
 {
-    if (success) {
-        _terrainAltitude = heights[0];
-        emit terrainAltitudeChanged(_terrainAltitude);
-        sender()->deleteLater();
-    }
+    _terrainAltitude = success ? heights[0] : qQNaN();
+    emit terrainAltitudeChanged(_terrainAltitude);
+    sender()->deleteLater();
 }
-- 
2.22.0