don't raise value error in scoreGazette if no blocks
this is a common casem, closes
@@ -329,7 +329,7 @@ def scoreGazette(record_pairs: Blocks,
first, record_pairs = peek(record_pairs)
if first is None:
- raise ValueError("No records to match")
+ return # terminate iteration
imap, pool = appropriate_imap(num_cores)
