=== modified file 'bin/confz'
--- bin/confz	2014-06-26 18:08:30 +0000
+++ bin/confz	2014-06-26 17:57:53 +0000
@@ -60,9 +60,7 @@
 	local var
 	local -a empty
 	for var in "$@"; do
-		if ! (($+vars[$var])) || [[ -z $vars[$var] ]]; then
-			empty+=( $var )
-		fi
+		[[ -z $vars[$var] ]] && empty+=( $var )
 	done
 	(( $#empty )) && die "required parameters are empty: ${(@q)empty}"
 }