TM Processing 21,6,21 packet not parsable

[samaloney]

Found during #272

2022-09-02 01:08:59,993 Packet parsing error: TM_21_6_21(SourcePacketHeader(version=0, packet_type=0, header_flag=1, process_id=91, packet_category=12, sequence_flag=0, sequence_count=4394, data_length=3960), TMDataHeader(pus_version=1, service_type=21, service_subtype=6, destination_id=0, scet_coarse=702730738, scet_fine=33712, datetime=702730738:33712))
idb version:IDB(2.26.36, /home/shane/stixcore/stixcore/data/idb/v2.26.36/idb.sqlite)
packet data:0x0dbc112a0f781015060029e2d1f283b015005bf36683516d01242b29c36b5900000001000794000c000100020004000800100020004000800100020004000800ffffffff00082b2b282529282a2b2c292a2a2329292a0a0101018000000000020100000000000000000000000100020000000000000002000000000000...
2022-09-02 01:09:00,114 Error processing file /data/stix/out/test/run_08_30_bak/LB/21/6/21/solo_LB_stix-21-6-21_0000000000-9999999999_V01_2203151617-62310.fits for 21, 6, 21
Traceback (most recent call last):
  File "/home/shane/stixcore/stixcore/processing/LBtoL0.py", line 113, in process_tm_type
--
    value, self._pos = self._readtoken(name, self._pos, length)
  File "/home/shane/stixcore_env/lib/python3.8/site-packages/bitstring.py", line 2070, in _readtoken
    raise ReadError("Reading off the end of the data. "
bitstring.ReadError: Reading off the end of the data. Tried to read 8 bits when only 0 available.
2022-09-02 01:09:00,119 Reading off the end of the data. Tried to read 8 bits when only 0 available.