register-server: Fix cluster count error message

[Jakob-Naucke]

Claimed more than one upon != 1 when it could also be zero. Fix.

[Jakob-Naucke]

This caused some confusion in (even though it does not close) #130.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: alicefr, Jakob-Naucke

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@Jakob-Naucke: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/operator-lifecycle-verify	6da1153	link	true	/test operator-lifecycle-verify
ci/prow/infra-provision-verify	6da1153	link	true	/test infra-provision-verify

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