Update to ZDoom r1662:

- Added ML_BLOCKUSE line flag, accessible through UDMF and Line_SetBlocking.
- Fixed handling of embedded WADs.
- Added Gez's A_CheckCeiling submission.
- Fixed: AM_NewResolution crashed when called from outside a level.
- Added support for Quake PAK files.
- Improved warning messages for WAD files with incorrect marker usage.
- complete restructuring of resource file handling for more flexibility and future
  extensions.
- Removed merging of special namespaces. For the texture manager this has
  become totally useless so there is no need to do this anymore. Not merging
  the namespaces also allows a much more reliable detection of lumps belonging
  to special namespaces so the ScanForFlatHack function is no longer needed.
  Instead, any lump up to F_END with a length of 4096 will be marked for 
  inclusion as a flat texture if no F_START marker is found.
- fixed MustConfirm parsing in MAPINFO
- Made the counting of intermission stats in Doom a GAMEINFO option so that
  it can be activated in all games.


git-svn-id: http://mancubus.net/svn/hosted/gzdoom/trunk@324 b0f79afe-0144-0410-b225-9a4edf0717df

src/am_map.cpp

@@ -914,6 +914,11 @@ void AM_maxOutWindowScale ()
 void AM_NewResolution()
 {
 	fixed_t oldmin = min_scale_mtof;
+	
+	if ( oldmin == 0 ) 
+	{
+		return; // [SP] Not in a game, exit!
+	}	
 	AM_calcMinMaxMtoF();
 	scale_mtof = Scale(scale_mtof, min_scale_mtof, oldmin);
 	scale_ftom = MapDiv(MAPUNIT, scale_mtof);