Initialized many variables

Fix for enemy invasions and reinforcements


git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@1192 3b4a5df2-a311-0410-b5c6-a8a6f20db521

Strategic/Map Screen Interface Map.cpp

@@ -6387,6 +6387,9 @@ void HandleLowerLevelMapBlit( void )
 		case( 3 ):	
 			GetVideoObject( &hHandle, guiSubLevel3 );
 			break;
+		default:
+			AssertMsg( 0, "Invalid underground sector level");
+			return;
 	}
 
 	// handle the blt of the sublevel