Fix empty responseUrl bypassing SLO URL fallback#648
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isset('')returnstruein PHP, so an emptyresponseUrlpasses the fallbackcheck andgetIdPSLOResponseUrl()returns''.This causes
Utils::redirect('')to throwREDIRECT_INVALID_URLduring broadcast SLO.Replace
isset()with!empty()so empty strings correctly fall through togetIdPSLOUrl().