Antoine Leblanc e2ce1972f6 Prevent empty subscription roots (fix hasura/graphql-engine#6898) ... ### Description We always build a subscription root, even when there was no possible fields. This breaks some third party clients, as the spec does not allow empty types in the schema. This PR fixes this by changing the `buildSubscriptionParser` helper to return a `Maybe` value, and harmonizes / cleans places where we build the subscription root. https://github.com/hasura/graphql-engine-mono/pull/2357 GitOrigin-RevId: 1aeae25e321eee957e7645c436d17e69207309fd		2021-09-16 07:42:46 +00:00
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check_no_empty_roots.yaml	Prevent empty subscription roots (fix hasura/graphql-engine#6898)	2021-09-16 07:42:46 +00:00