Merge pull request #6682 from Rogni/fixTaceoffBug

fix bug - 0 alt of Takeoff after load mission from vehicle

src/MissionManager/SimpleMissionItem.cc

@@ -127,7 +127,7 @@ SimpleMissionItem::SimpleMissionItem(Vehicle* vehicle, bool flyView, const Missi
     }
 
     _isCurrentItem = missionItem.isCurrentItem();
-    _altitudeFact.setRawValue(specifiesCoordinate() ? _missionItem._param7Fact.rawValue() : qQNaN());
+    _altitudeFact.setRawValue(specifiesCoordinate() || specifiesAltitudeOnly() ? _missionItem._param7Fact.rawValue() : qQNaN());
     _amslAltAboveTerrainFact.setRawValue(qQNaN());
 
     // In flyView we skip some of the intialization to save memory