fix empty date issue if the alias has legacy empty date.

djangocms_version_locking/cms_config.py

@@ -9,14 +9,16 @@
 
 
 def add_alias_version_lock(obj, field):
-    version = obj.versions.all()[0]
+    # add None obj check, if the legacy data has empty value.
     lock_icon = ""
-    if version.state == DRAFT and version_is_locked(version):
-        lock_icon = mark_safe('<span class="cms-icon cms-icon-lock"></span>')
+    if obj:
+        version = obj.versions.all()[0]
+        if version.state == DRAFT and version_is_locked(version):
+            lock_icon = mark_safe('<span class="cms-icon cms-icon-lock"></span>')
     return format_html(
         "{is_locked}{field_value}",
         is_locked=lock_icon,
-        field_value=getattr(obj, field),
+        field_value=getattr(obj, field, '-'),
     )
 
 

djangocms_version_locking/monkeypatch/djangocms_alias/admin.py

@@ -36,6 +36,9 @@ def _get_content_obj(self, obj: Alias):
         return content_obj
 
     def _get_edit_link(self, obj: Alias, request: HttpRequest, disabled: bool = False):
+        if self._get_content_obj(obj):
+            # Don't display the link if it can't be edited, as the content is empty.
+            return ""
         version = proxy_model(self._get_content_obj(obj).versions.all()[0], self._get_content_obj(obj))
 
         if version.state not in (DRAFT, PUBLISHED):
@@ -70,6 +73,9 @@ def _get_edit_link(self, obj: Alias, request: HttpRequest, disabled: bool = Fals
         )
 
     def _get_manage_versions_link(self, obj: Alias, request: HttpRequest, disabled: bool = False):
+        if self._get_content_obj(obj):
+            # Don't display the link if it can't find version list urls, as the content is empty.
+            return ""
         url = version_list_url(self._get_content_obj(obj))
         return self.admin_action_button(
             url,