svd_bank_snr.py gstlal_inspiral_calc_snr: fix sanity check for --start and --end

gstlal-inspiral/bin/gstlal_inspiral_calc_snr

@@ -147,8 +147,9 @@ def parse_command_line():
 	options, args = parser.parse_args()
 
 	# Check SNR series output
-	if options.start >= options.end:
-		raise ValueError("--start must less than --end.")
+	if options.start and options.end:
+		if options.start >= options.end:
+			raise ValueError("--start must less than --end.")
 
 	# Setting up GW data
 	gw_data_source_info = datasource.GWDataSourceInfo(options)

gstlal-inspiral/python/svd_bank_snr.py

@@ -122,22 +122,25 @@ class SNR_Pipeline(object):
 	def get_snr_series(self, COMPLEX = False, row_number = None, start = None, end = None):
 		gps_start = self.snr_info["epoch"].gpsSeconds + self.snr_info["epoch"].gpsNanoSeconds * 10.**-9
 		gps = gps_start + numpy.arange(len(self.snr_info["data"])) * self.snr_info["deltaT"]
+		if start and end:
+			if start >= end:
+				raise ValueError("Start time must be less than end time.")
 
-		if start >= end:
-			raise ValueError("Start time must be less than end time.")
+			if start - gps[0] >= 0 and start - gps[-1] <= 0:
+				s = abs(gps - start).argmin()
+			else:
+				raise ValueError("Invalid choice of start time %f." % start)
 
-		if start - gps[0] >= 0 and start - gps[-1] <= 0:
-			s = abs(gps - start).argmin()
-		else:
-			raise ValueError("Invalid choice of start time %f." % start)
+			if end - gps[0] >= 0 and end - gps[-1] <= 0:
+				e = abs(gps - end).argmin()
+			else:
+				raise ValueError("Invalid choice of end time %f." % end)
 
-		if end - gps[0] >= 0 and end - gps[-1] <= 0:
-			e = abs(gps - end).argmin()
+			self.snr_info["epoch"] = gps[s]
+			self.snr_info["data"] = self.snr_info["data"][s:e].T
 		else:
-			raise ValueError("Invalid choice of end time %f." % end)
-
-		self.snr_info["epoch"] = gps[s]
-		self.snr_info["data"] = self.snr_info["data"][s:e].T
+			self.snr_info["epoch"] = gps[0]
+			self.snr_info["data"] = self.snr_info["data"].T
 
 		if row_number is None:
 			temp = []