fix crash because of NULL command line pointer

Modified: trunk/reactos/subsys/system/explorer/explorer.cpp

--- trunk/reactos/subsys/system/explorer/explorer.cpp	2005-10-09 15:12:01 UTC (rev 18377)
+++ trunk/reactos/subsys/system/explorer/explorer.cpp	2005-10-09 15:12:13 UTC (rev 18378)
@@ -561,7 +561,8 @@

 	cmd._cmdShow = cmdShow;
 
 	 // parse command line options, which may overwrite the MDI flag

-	cmd.ParseCmdLine(lpCmdLine);

+	if (lpCmdLine)
+		cmd.ParseCmdLine(lpCmdLine);

 
 	 // create main window
 	MainFrameBase::Create(cmd);