fix: excluding copying file if default stack is not found

Author: pacostas

scripts/create.sh

@@ -67,7 +67,9 @@ function main() {
   if [ -f "${IMAGES_JSON}" ]; then
     # we need to copy images.json for inclusion in the build image
     defaultStackPath=$(jq -r '.images[] | select(.name == "default") | .config_dir' "${IMAGES_JSON}")
-    cp $IMAGES_JSON $ROOT_DIR/$defaultStackPath/images.json
+    if [ -n "$defaultStackPath" ]; then
+      cp $IMAGES_JSON "${ROOT_DIR}/${defaultStackPath}/images.json"
+    fi
   fi
 
   # if stack or build argument is provided but not both, then throw an error