Fix check if $blend exists.

lib/libdevuansdk

@@ -1 +1 @@
-Subproject commit 589d62ca0eb8d72149d3c8a54c310a5255ad47dd
+Subproject commit c1c6fc8c0686ecdb30da61775f9015798133fb15

sdk

@@ -73,7 +73,7 @@ load() {
 			sed 1q "$dlpath" | grep -q '^#!/usr/bin/env zsh' && blendlib="$dlpath"
 		fi
 
-		if [[ -z "$blendlib" ]]; then
+		if [[ -z "$blendlib" ]] && [[ -n "$blend" ]]; then
 			[[ -n "$dlpath" ]] && blend="$dlpath"
 			act "trying to parse an unknown blend"
 			# Check if it's a Dockerfile