fix: invalid dataset schema (apache#20826)

(cherry picked from commit 3fb5c79)

superset/dashboards/api.py

@@ -28,7 +28,7 @@
 from flask_appbuilder.api import expose, protect, rison, safe
 from flask_appbuilder.hooks import before_request
 from flask_appbuilder.models.sqla.interface import SQLAInterface
-from flask_babel import ngettext
+from flask_babel import gettext, ngettext
 from marshmallow import ValidationError
 from werkzeug.wrappers import Response as WerkzeugResponse
 from werkzeug.wsgi import FileWrapper
@@ -383,6 +383,8 @@ def get_datasets(self, id_or_slug: str) -> Response:
                 self.dashboard_dataset_schema.dump(dataset) for dataset in datasets
             ]
             return self.response(200, result=result)
+        except TypeError:
+            return self.response_400(message=gettext("Dataset schema is invalid."))
         except DashboardAccessDeniedError:
             return self.response_403()
         except DashboardNotFoundError:

superset/dashboards/schemas.py

@@ -206,7 +206,7 @@ class DashboardDatasetSchema(Schema):
     health_check_message = fields.Str()
     fetch_values_predicate = fields.Str()
     template_params = fields.Str()
-    owners = fields.List(fields.Int())
+    owners = fields.List(fields.Dict())
     columns = fields.List(fields.Dict())
     column_types = fields.List(fields.Int())
     metrics = fields.List(fields.Dict())