From b60dcb283a9f3526d98050a210c2f06641b83403 Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Thu, 20 May 2021 09:41:42 +0200
Subject: [PATCH] GitHub CI: fixed unbound variables

FEATURES may not be defined in other workflows than C/C++ CI.
---
 .github/scripts/Linux/prepare.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/scripts/Linux/prepare.sh b/.github/scripts/Linux/prepare.sh
index 1f23b9aee..ec6f43c2b 100755
--- a/.github/scripts/Linux/prepare.sh
+++ b/.github/scripts/Linux/prepare.sh
@@ -51,7 +51,7 @@ sudo ./install
 # Install AJA
 if [ -n "$SDK_URL" ]; then
         if curl -f -S $SDK_URL/ntv2sdklinux.zip -O; then
-                FEATURES="$FEATURES --enable-aja"
+                FEATURES="${FEATURES:+$FEATURES }--enable-aja"
                 echo "FEATURES=$FEATURES" >> $GITHUB_ENV
                 unzip ntv2sdklinux.zip -d /var/tmp
                 mv /var/tmp/ntv2sdk* /var/tmp/ntv2sdk