ShellPkg: fix 'ls' handling of empty drives where there is not even an "." or ".." directory.

Signed-off-by: jcarsey
Reviewed-by: winddy_zhang@byosoft.com.cn

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12981 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Application/Shell/ShellProtocol.c

@@ -1799,7 +1799,7 @@ CreateAndPopulateShellFileInfo(
   if (ShellFileListItem == NULL) {
     return (NULL);
   }
-  if (Info != NULL) {
+  if (Info != NULL && Info->Size != 0) {
     ShellFileListItem->Info = AllocateZeroPool((UINTN)Info->Size);
     if (ShellFileListItem->Info == NULL) {
       FreePool(ShellFileListItem);