fix: Workaround for

This is a workaround as the CMS expects such an attribute, but I have no
idea under what conditions it has to be set to True or False. Maybe the
MENU_TYPE of the Blog AppConfig?

I tried both True and False without any noticeable difference (at least
while keeping `BlogConfig.menu_structure` set to `MENU_TYPE_COMPLETE`).

djangocms_blog/models.py

@@ -578,6 +578,13 @@ class Meta:
     objects = GenericDateTaggedManager()
     admin_manager = AdminDateTaggedManager()
 
+    @property
+    def in_navigation(self):
+        # TODO: This is a workaround as the CMS expects such an attribute, but I have no idea
+        # under what conditions it has to be set to True or False. Maybe the MENU_TYPE of the
+        # Blog AppConfig?
+        return True
+
     @property
     def author(self):
         return self.post.author