Change-Id: Id7f81677389cb853da064a43f1d5d54b2271f0c0
@@ -18,7 +18,7 @@
# If the SUPERPROJECT_REVISION is defined as a sha, use this as the default value if no
# SUPERPROJECT_SHA is specified.
-if [[ $SUPERPROJECT_REVISION =~ [0-9a-f]{40} ]]; then
+if [[ ${SUPERPROJECT_REVISION:-} =~ [0-9a-f]{40} ]]; then
: ${KZIP_NAME:=${SUPERPROJECT_REVISION:-}}
fi