Upgrade spectacular to the latest version

https://redmine.teklia.com/issues/7391

Closes #1769 (closed), nukes !1471 (closed)

arkindex/project/openapi/schema.py

@@ -32,5 +32,6 @@ class AutoSchema(BaseAutoSchema):
         Spectacular does not include any pagination parameters.
         """
         operation = super().get_operation(*args, **kwargs)
-        operation["x-paginated"] = self._is_list_view() and self._get_paginator() is not None
+        if operation is not None:
+            operation["x-paginated"] = self._is_list_view() and self._get_paginator() is not None
         return operation