Quote multiline Strings

builder.sh

@@ -30,10 +30,10 @@ ARCHITECTURES_DEFAULT=" \
 "
 BRANCH_DEFAULT=experimental
 
-if [ -z ${BRANCH} ]; then
+if [ -z "${BRANCH}" ]; then
 	BRANCH=$BRANCH_DEFAULT
 fi
-if [ -z ${ARCHITECTURES} ]; then
+if [ -z "${ARCHITECTURES}" ]; then
 	ARCHITECTURES=$ARCHITECTURES_DEFAULT
 fi