From 047d55d83b1df9af60c7c48058c34d85041b08e1 Mon Sep 17 00:00:00 2001
From: Achim Gsell <achim.gsell@psi.ch>
Date: Mon, 2 Sep 2024 18:23:51 +0200
Subject: [PATCH] build-system: bugfix: handle empty variants

---
 Pmodules/modbuild.in | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Pmodules/modbuild.in b/Pmodules/modbuild.in
index 16a23d2..7121b44 100644
--- a/Pmodules/modbuild.in
+++ b/Pmodules/modbuild.in
@@ -818,6 +818,11 @@ build_modules_yaml_v1(){
 
 		local -- type_of_key=''
 		type_of_key=$( ${yq} -e ".variants | type" 2>/dev/null <<<"${yaml_input}")
+		if [[ "${type_of_key}" == '!!null' ]]; then
+			result=''
+			n=0
+			return 0
+                fi
 		if [[ "${type_of_key}" != '!!seq' ]]; then
 			die_invalid_variants_block "${name}" "${version}" \
 						   "${type_of_key}"