dags/util.py: do not zero pad segments outside of requested times within partition_by_time()

gstlal/python/dags/util.py

@@ -411,7 +411,7 @@ def partition_by_time(span, segdict, ifos, min_ifos=1, max_livetime=14440, start
 
 	# calculate start/end times from each bin and pad accordingly
 	half_pad = start_pad / 2
-	return [segs.extent().protract(half_pad).shift(-half_pad) for segs in time_bins]
+	return [segs.extent().protract(half_pad).shift(-half_pad) if i != 0 else segs.extent() for i, segs in enumerate(time_bins)]
 
 
 #