[navaraf] 12763: Don't crash if ShellFolder doesn't implement the IID_ISFHelper interface.

Don't crash if ShellFolder doesn't implement the IID_ISFHelper
interface.
Modified: trunk/reactos/lib/shell32/shlview.c
  _____  

Modified: trunk/reactos/lib/shell32/shlview.c
--- trunk/reactos/lib/shell32/shlview.c	2005-01-03 20:43:23 UTC (rev
12762)
+++ trunk/reactos/lib/shell32/shlview.c	2005-01-03 21:19:25 UTC (rev
12763)
@@ -1456,6 +1456,9 @@

 		IShellFolder_QueryInterface(This->pSFParent,
&IID_ISFHelper,
 		 	(LPVOID*)&psfhlp);
 
+		if (psfhlp == NULL)
+		  break;
+
 		if(!(i = ListView_GetSelectedCount(This->hWndList)))
 		  break;