From 00a897f29c473e6c0668af29022601d54e8f43b6 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Tue, 5 Jun 2018 18:33:38 +0200
Subject: [PATCH] Better altitude null message

---
 src/blackmisc/aviation/altitude.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/blackmisc/aviation/altitude.cpp b/src/blackmisc/aviation/altitude.cpp
index 42ee415e7..0b16a560c 100644
--- a/src/blackmisc/aviation/altitude.cpp
+++ b/src/blackmisc/aviation/altitude.cpp
@@ -62,6 +62,9 @@ namespace BlackMisc
 
         QString CAltitude::convertToQString(bool i18n) const
         {
+            static const QString n("null");
+            if (this->isNull()) { return n; }
+
             if (this->m_datum == FlightLevel)
             {
                 static const QString fls("FL%1");