Error using CARTOframes for downloading geometry table

cartoframes/data/observatory/catalog/repository/entity_repo.py

@@ -54,7 +54,7 @@ def _get_filtered_entities(self, filters):
         rows = self._get_rows(cleaned_filters)
 
         if len(rows) == 0:
-            return None
+            return CatalogList([])
 
         normalized_data = [self._get_entity_class()(self._map_row(row)) for row in rows]
         return CatalogList(normalized_data)

tests/unit/data/observatory/catalog/repository/test_category_repo.py

@@ -41,7 +41,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert categories is None
+        assert categories == []
 
     @patch.object(RepoClient, 'get_categories')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_country_repo.py

@@ -40,7 +40,7 @@ def test_get_all_when_empty(self, mocked_repo):
         countries = repo.get_all()
 
         # Then
-        assert countries is None
+        assert countries == []
 
     @patch.object(RepoClient, 'get_countries')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_dataset_repo.py

@@ -59,7 +59,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert datasets is None
+        assert datasets == []
 
     @patch.object(RepoClient, 'get_datasets')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_geography_repo.py

@@ -59,7 +59,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert geographies is None
+        assert geographies == []
 
     @patch.object(RepoClient, 'get_geographies')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_provider_repo.py

@@ -41,7 +41,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert providers is None
+        assert providers == []
 
     @patch.object(RepoClient, 'get_providers')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_variable_group_repo.py

@@ -41,7 +41,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert variables_groups is None
+        assert variables_groups == []
 
     @patch.object(RepoClient, 'get_variables_groups')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):

tests/unit/data/observatory/catalog/repository/test_variable_repo.py

@@ -41,7 +41,7 @@ def test_get_all_when_empty(self, mocked_repo):
 
         # Then
         mocked_repo.assert_called_once_with(None)
-        assert variables is None
+        assert variables == []
 
     @patch.object(RepoClient, 'get_variables')
     def test_get_all_only_uses_allowed_filters(self, mocked_repo):