Fix export of collections

Author: gotcha

CHANGES.rst

@@ -5,8 +5,8 @@ Changelog
 1.15 (unreleased)
 -----------------
 
-- Nothing changed yet.
-
+- Fix collections export.
+  [gotcha]
 
 1.14 (2025-04-12)
 -----------------

src/collective/exportimport/export_content.py

@@ -9,6 +9,7 @@
 from collective.exportimport.interfaces import IRawRichTextMarker
 from operator import itemgetter
 from plone import api
+from plone.app.contenttypes.interfaces import ICollection
 from plone.app.layout.viewlets.content import ContentHistoryViewlet
 from plone.i18n.normalizer.interfaces import IIDNormalizer
 from plone.restapi.interfaces import ISerializeToJson
@@ -386,6 +387,8 @@ def export_content(self):
                     item = serializer()
                 elif getattr(aq_base(obj), "isPrincipiaFolderish", False):
                     item = serializer(include_items=False)
+                elif ICollection.providedBy(obj):
+                    item = serializer(include_items=False)
                 else:
                     item = serializer()
                 item = self.update_export_data(item, obj)