--- trunk/grubby/new-kernel-pkg	2014/07/16 10:40:51	2686
+++ trunk/grubby/new-kernel-pkg	2014/07/16 10:50:58	2699
@@ -191,7 +191,7 @@
 	fi
 
 	DEVTREE=""
-	if [ -f ${devtreefile} ]
+	if [[ x${devtreefile} != x ]] && [ -f ${devtreefile} ]
 	then
 		[[ -n ${verbose} ]] && echo "found ${devtreefile} and using it with grubby"
 		DEVTREE="--devtree ${devtreefile}"