Merge branch 'master' into jgrpp-beta

# Conflicts:
#	src/command.cpp
#	src/console_cmds.cpp
#	src/group_gui.cpp
#	src/lang/catalan.txt
#	src/lang/czech.txt
#	src/lang/danish.txt
#	src/lang/greek.txt
#	src/lang/hungarian.txt
#	src/lang/irish.txt
#	src/lang/japanese.txt
#	src/lang/luxembourgish.txt
#	src/lang/norwegian_bokmal.txt
#	src/lang/romanian.txt
#	src/lang/russian.txt
#	src/lang/serbian.txt
#	src/lang/simplified_chinese.txt
#	src/lang/slovak.txt
#	src/lang/spanish_MX.txt
#	src/lang/swedish.txt
#	src/lang/tamil.txt
#	src/lang/traditional_chinese.txt
#	src/lang/turkish.txt
#	src/lang/ukrainian.txt
#	src/lang/vietnamese.txt
#	src/network/network.cpp
#	src/network/network_client.cpp
#	src/network/network_func.h
#	src/network/network_internal.h
#	src/network/network_server.cpp
#	src/network/network_server.h
#	src/saveload/afterload.cpp
#	src/saveload/newgrf_sl.cpp
#	src/saveload/saveload.h
#	src/script/script_instance.cpp
#	src/toolbar_gui.cpp
#	src/toolbar_gui.h
#	src/vehicle_gui.cpp
#	src/widgets/rail_widget.h
#	src/widgets/vehicle_widget.h
#	src/window.cpp

src/newgrf.cpp

@@ -5404,6 +5404,11 @@ static void NewSpriteGroup(ByteReader *buf)
 					grfmsg(6, "NewSpriteGroup: New SpriteGroup 0x%02X, %u loaded, %u loading",
 							setid, num_loaded, num_loading);
 
+					if (num_loaded + num_loading == 0) {
+						grfmsg(1, "NewSpriteGroup: no result, skipping invalid RealSpriteGroup");
+						break;
+					}
+
 					if (num_loaded + num_loading == 1) {
 						/* Avoid creating 'Real' sprite group if only one option. */
 						uint16 spriteid = buf->ReadWord();