export-pkgbuild-keys: fix export for packages without validpgpkeys

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/export-pkgbuild-keys.in b/export-pkgbuild-keys.in
index c10e4d1..8697b3d 100644
--- a/export-pkgbuild-keys.in
+++ b/export-pkgbuild-keys.in
@@ -37,7 +37,9 @@ fi
 mapfile -t validpgpkeys < <(
 	# shellcheck source=PKGBUILD.proto
 	. ./PKGBUILD
-	printf "%s\n" "${validpgpkeys[@]}"
+	if (( ${#validpgpkeys[@]} )); then
+		printf "%s\n" "${validpgpkeys[@]}"
+	fi
 )
 
 msg "Exporting ${#validpgpkeys[@]} PGP keys..."