Fix problem where KMS key not being used as default

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@16013 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/perl/xCAT/Template.pm

@@ -484,7 +484,7 @@ sub get_win_prodkey {
 		$keyent = $keytab->getAttribs({product=>$osvariant},"key");
 	   }
 	}
-	if ($keyent) { 
+	if ($keyent and $keyent->{key}) { 
 		return "<ProductKey><WillShowUI>OnError</WillShowUI><Key>".$keyent->{key}."</Key></ProductKey>";
 	}
 	if ($xCAT::WinUtils::kmskeymap{$osvariant}) {