changed default for channel name to not be a string

gstlal-ugly/bin/gstlal_inspiral

@@ -106,7 +106,7 @@ def parse_command_line():
 	parser.add_option("--injections", metavar = "filename", help = "Set the name of the LIGO light-weight XML file from which to load injections (optional).")
 	parser.add_option("--veto-segments-file", metavar = "filename", help = "Set the name of the LIGO light-weight XML file from which to load vetoes (optional).")
 	parser.add_option("--veto-segments-name", metavar = "name", help = "Set the name of the segments to extract from the segment tables and use as the veto list.", default = "vetoes")
-	parser.add_option("--channel-name", metavar = "name", default = "LSC-STRAIN", action = "append", help = "Set the name of the channel to process (optional).  The default is \"LSC-STRAIN\" for all detectors. Override with IFO=CHANNEL-NAME can be given multiple times")
+	parser.add_option("--channel-name", metavar = "name", action = "append", help = "Set the name of the channel to process (optional).  The default is \"LSC-STRAIN\" for all detectors. Override with IFO=CHANNEL-NAME can be given multiple times")
 	parser.add_option("--nxydump-segment", metavar = "start:stop", default = ":", help = "Set the time interval to dump from nxydump elments (optional).  The default is \":\", i.e. dump all time.")
 	parser.add_option("--output", metavar = "filename", help = "Set the name of the LIGO light-weight XML output file *.{xml,xml.gz} or an SQLite database *.sqlite (required).")
 	parser.add_option("--reference-psd", metavar = "filename", help = "Instead of measuring the noise spectrum, load the spectrum from this LIGO light-weight XML file (optional).")