Add conditional check before setting attributes in SetSDKSetAttributes

[a-hilaly]

Add a conditional check in SetSDKSetAttributes to only call SetAttributes
when the attribute map is not empty. This prevents API validation errors
that occur when setting an empty attribute map.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-bot]

/retest
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[a-hilaly]

/retest

[a-hilaly]

/retest

[a-hilaly]

/test eks-controller-test

[ack-prow]

@a-hilaly: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
verify-attribution	5bdd3b9	link	false	/test verify-attribution

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[a-hilaly]

/test eks-controller-test