If there was no maxID set for a domain, the search filter to check
whether the UID was available would always return empty (because
no UIDs can be <= 0)
This patch changes the search filter if the maxID is unset so that
it has no upper limit
This resolves
https://fedorahosted.org/sssd/ticket/119
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Stephen Gallagher
RHCE 804006346421761
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