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Handle [] returns from GraphQL analysis

Hordur Freyr Yngvason requested to merge handle-edge-case-in-graphql-logger into master

What does this MR do and why?

The method GraphQL::Analysis::AST.analyze_query intentionally returns [] in various edge cases. We should handle that gracefully.

See this job failure for an example in the wild: https://gitlab.com/gitlab-org/gitlab/-/jobs/6961795086

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Edited by Hordur Freyr Yngvason

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