Version 20220621

In case the validpgpkeys array is empty or undefined, the empty printf
line only included a single line break which lead to mapfile -t
consuming it as an array with 1 element consisting of an empty string.

Fix this by only calling the printf in case the validpgpkeys array is
not empty. Without any output, the mapfile -t will simply produce an
empty array.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

Makefile

@@ -1,4 +1,4 @@
-V=20220620
+V=20220621
 BUILDTOOLVER ?= $(V)
 
 PREFIX = /usr/local

export-pkgbuild-keys.in

@@ -37,7 +37,9 @@ fi
 mapfile -t validpgpkeys < <(
 	# shellcheck source=PKGBUILD.proto
 	. ./PKGBUILD
+	if (( ${#validpgpkeys[@]} )); then
 		printf "%s\n" "${validpgpkeys[@]}"
+	fi
 )
 
 msg "Exporting ${#validpgpkeys[@]} PGP keys..."