use the ready_for_extinction method in the marg job

gstlal-inspiral/bin/gstlal_inspiral_marginalize_likelihoods_online

@@ -245,7 +245,7 @@ def main():
 				# get the zerolag pdf for this bin and use it to perform bin-specific extinction
 				zerolag_counts_url = url_from_registry(reg, zerolag_counts_path)
 				pdf += far.RankingStatPDF.from_xml(ligolw_utils.load_url(zerolag_counts_url, verbose = options.verbose, contenthandler = far.RankingStat.LIGOLWContentHandler), u"gstlal_inspiral_likelihood")
-				if sum(pdf.zero_lag_lr_lnpdf.array) > 0:
+				if pdf.ready_for_extinction():
 					# LR calculation has started and we are ready to perform first-round extinction
 					if data:
 						data += pdf.new_with_extinction()