fix: skip graphql query if parameter is null

[enzomerca]

What problem is this solving?

We were observing the error Variable "$email" of required type "String!" was not provided on the logs and this PR avoid calls that were causing the error.
Now the getBinding query is skipped if the userEmail parameter is empty (resulting in the same behaviour)

How to test it?

Login and go to My Account (Profile) page
Looking at the Network tab of the browser inspector you can observe the error is not happening (compared to a workspace without the fix)
Workspace

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[github-actions]

	Messages
📖	❤️ Thanks!
📖	🎉 PR additions = 4, PR deletions = 0

Generated by 🚫 dangerJS against 8b9d0f4

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vtex-io-ci-cd]

Your PR has been merged! App is being published. 🚀
Version 3.1.0 → 3.1.1

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vtex deploy vtex.b2b-organizations@3.1.1

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