iDQ: Add sanity check for idq inputs. Either both or neither of the...

iDQ: Add sanity check for idq inputs. Either both or neither of the idq-channel-names and idq-gate-threshold must be provided.

gstlal-inspiral/bin/gstlal_inspiral

@@ -502,6 +502,11 @@ def parse_command_line():
 		raise ValueError("--min-instruments must be >= 1")
 	if options.min_instruments > len(detectors.channel_dict):
 		raise ValueError("--min-instruments (%d) is greater than the number of --channel-name's (%d)" % (options.min_instruments, len(detectors.channel_dict)))
+	if options.idq_gate_threshold:
+		if not options.idq_channel_name:
+			raise ValueError("--idq-gate-threshold supplied, but not --idq-channel-name. Please supply idq channel name for extraction.")
+	elif options.idq_channel_name:
+			raise ValueError("--idq-channel-name provided, but not --idq-gate-threshold. Please supply a threshold for gating with iDQ.")
 
 	#
 	# Option checks complete