fix: graphQLErrors in Error Link if networkError.result is an empty string

[PaLy]

Checklist:

• If this PR contains changes to the library itself (not necessary for e.g. docs updates), please include a changeset (see CONTRIBUTING.md)
• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[apollo-cla]

@PaLy: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[netlify]

‼️ Deploy request for apollo-client-docs rejected.

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🔨 Latest commit	9a235d1

[changeset-bot]

🦋 Changeset detected

Latest commit: 9a235d1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@apollo/client	Patch

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