Set author as nullable in snippet GraphQL Type

Francisco Javier Lópezrequested to merge
fj-change-snippet-author-nullable-graphql-type into master

What does this MR do?

Sets the Snippet author field in the GraphQL type as nullable because there are situations where that association is not sent.

Refs #220303 (closed)

Does this MR meet the acceptance criteria?

Conformity

Edited by Francisco Javier López

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