IDENTITY-6185: Improve DefaultClaimHandler handleClaim() logic

[mefarazath]

Proposed changes in this pull request

• If the Service Provider does not request any claims, there is no point continuing with handing claim mapping and claim transformation etc.This improvement is to stop the claim handling if the service provider does not request any claims since the total operation is costly.

Checklist (for reviewing)

General

• Is this PR explained thoroughly? All code changes must be accounted for in the PR description.
• Is the PR labeled correctly?

Functionality

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• Does the UI work as expected? There should be no Javascript errors in the console; all resources should load. There should be no unexpected errors. Deliberately try to break the feature to find out if there are corner cases that are not handled.

Code

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• Does the PR introduce any inefficient database requests? Use the debug server to check for duplicate requests.
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Tests

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Security

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Documentation

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• Are reusable components documented? If this PR introduces components that are relevant to other developers (for instance a mixin for a view or a generic form) they should be documented in the Wiki.