Merge pull request #234 from collective/non-in-default-pages

safeguard against empty/None values in default_page_uuid

src/collective/exportimport/import_other.py

@@ -535,7 +535,7 @@ def import_default_pages(self, data):
                     obj = api.portal.get()
                 else:
                     continue
-            if "default_page_uuid" in item:
+            if "default_page_uuid" in item and item.get("default_page_uuid", None):
                 default_page_obj = api.content.get(UID=item["default_page_uuid"])
                 if not default_page_obj:
                     logger.info("Default page missing: %s", item["default_page_uuid"])