Added missing fallback elevation fetch

.appveyor.yml

@@ -1,4 +1,4 @@
-version: 13.20.{build}
+version: 13.21.{build}
 
 configuration:
   - Release

gpxsee.pro

@@ -3,7 +3,7 @@ unix:!macx:!android {
 } else {
     TARGET = GPXSee
 }
-VERSION = 13.20
+VERSION = 13.21
 
 
 QT += core \

pkg/windows/gpxsee64.nsi

@@ -37,7 +37,7 @@ Unicode true
 ; The name of the installer
 Name "GPXSee"
 ; Program version
-!define VERSION "13.20"
+!define VERSION "13.21"
 
 ; The file to write
 OutFile "GPXSee-${VERSION}_x64.exe"

src/map/imgmap.cpp

@@ -269,9 +269,11 @@ void IMGMap::draw(QPainter *painter, const QRectF &rect, Flags flags)
 
 double IMGMap::elevation(const Coordinates &c)
 {
+	MapData *d = _data.first();
+
+	if (d->hasDEM()) {
 		QList<MapData::Elevation> tiles;
 		DEM::DEMTRee tree;
-	MapData *d = _data.first();
 		double ele = NAN;
 
 		d->elevations(RectC(Coordinates(c), Coordinates(c)), d->zooms().max(),
@@ -281,6 +283,8 @@ double IMGMap::elevation(const Coordinates &c)
 		DEM::searchTree(tree, c, ele);
 
 		return ele;
+	} else
+		return Map::elevation(c);
 }
 
 Map* IMGMap::createIMG(const QString &path, const Projection &proj, bool *isDir)