From ec14050890fb4705f1822abd12c60a2d39a1384b Mon Sep 17 00:00:00 2001
From: Stuart Buchanan <stuart_d_buchanan@yahoo.co.uk>
Date: Sat, 22 Dec 2018 16:52:05 +0000
Subject: [PATCH] General tiles with only BUILDING_LIST

Bug found during code-read.  If tile just contained BUILDING_LIST
entries (i.e. no OBJECT_STATIC or OBJECT_SIGN entries), then it would
not generate.
---
 simgear/scene/tgdb/ReaderWriterSTG.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/simgear/scene/tgdb/ReaderWriterSTG.cxx b/simgear/scene/tgdb/ReaderWriterSTG.cxx
index 46f73ba9..4a79e8ec 100644
--- a/simgear/scene/tgdb/ReaderWriterSTG.cxx
+++ b/simgear/scene/tgdb/ReaderWriterSTG.cxx
@@ -586,7 +586,7 @@ struct ReaderWriterSTG::_ModelBin {
             i->_elev += elevation(*terrainGroup, SGGeod::fromDeg(i->_lon, i->_lat));
         }
 
-        if (_objectStaticList.empty() && _signList.empty()) {
+        if (_objectStaticList.empty() && _signList.empty() && (_buildingListList.size() == 0)) {
             // The simple case, just return the terrain group
             return terrainGroup.release();
         } else {