gstlal_cherenkov_calc_rank_pdfs: fix process start time

gstlal-burst/bin/gstlal_cherenkov_calc_rank_pdfs

@@ -89,12 +89,22 @@ def parse_command_line():
 options, urls, paramdict = parse_command_line()
 
 
+#
+# start the output document and record our start time
+#
+
+
+xmldoc = ligolw.Document()
+xmldoc.appendChild(ligolw.LIGO_LW())
+
+
 #
 # load parameter distribution data
 #
 
 
 rankingstat = cherenkov_rankingstat.marginalize_rankingstat_urls(urls, verbose = options.verbose)
+process = ligolw_process.register_to_xmldoc(xmldoc, "gstlal_cherenkov_calc_rank_pdfs", paramdict = paramdict, instruments = rankingstat.instruments)
 
 
 #
@@ -115,13 +125,10 @@ rankingstatpdf = cherenkov_rankingstat.RankingStatPDF(rankingstat, nsamples = op
 
 
 #
-# Write the parameter and ranking statistic distribution data to a file
+# Write the ranking statistic distribution data to a file
 #
 
 
-xmldoc = ligolw.Document()
-xmldoc.appendChild(ligolw.LIGO_LW())
-process = ligolw_process.register_to_xmldoc(xmldoc, "gstlal_cherenkov_calc_rank_pdfs", paramdict = paramdict, instruments = rankingstat.instruments)
 xmldoc.childNodes[-1].appendChild(rankingstatpdf.to_xml("gstlal_cherenkov_rankingstat_pdf"))
 process.set_end_time_now()
 ligolw_utils.write_filename(xmldoc, options.output, verbose = options.verbose)