Fix null pointer dereference when running g_kill command in disconnected state.

Author: nitrocaster

src/xrGame/console_commands_mp.cpp

@@ -155,7 +155,8 @@ class CCC_Kill : public IConsole_Command {
 	{
 		if (IsGameTypeSingle())		
 										return;
-		
+        if (!g_pGameLevel)
+            return;
 		if (Game().local_player && 
 			Game().local_player->testFlag(GAME_PLAYER_FLAG_VERY_VERY_DEAD)) 
 										return;