Don't error when encountering a temp-type segment

These can happen if a downloader or backfiller dies suddenly.
We treat it similarly to partial but lacking any hash.

At some point in the future we should probably have something
to find any temp segments, hash them and rename them to partials.

common/common/segments.py

@@ -55,16 +55,17 @@ def parse_segment_path(path):
 		if len(parts) != 4:
 			raise ValueError("Not enough dashes in filename")
 		time, duration, type, hash = parts
-		if type not in ('full', 'partial'):
+		if type not in ('full', 'partial', 'temp'):
 			raise ValueError("Unknown type {!r}".format(type))
+		hash = None if type == 'temp' else unpadded_b64_decode(hash)
 		return SegmentInfo(
 			path = path,
 			stream = stream,
 			variant = variant,
 			start = datetime.datetime.strptime("{}:{}".format(hour, time), "%Y-%m-%dT%H:%M:%S.%f"),
 			duration = datetime.timedelta(seconds=float(duration)),
-			is_partial = type == "partial",
+			is_partial = type != "full",
-			hash = unpadded_b64_decode(hash),
+			hash = hash,
 		)
 	except ValueError as e:
 		# wrap error but preserve original traceback