Tomo: sinogram related

Traceback (most recent call last):
  File "/users/blissadm/local/daiquiri.git/daiquiri/core/hardware/bliss/scans.py", line 64, in _scan_start
    cb(scanid, info.get("type", "none"), info["title"], metadata=info)
  File "/users/blissadm/local/daiquiri.git/daiquiri/core/components/tomo/component.py", line 219, in new_scan
    {
  File "/users/blissadm/local/daiquiri.git/daiquiri/core/components/tomo/component.py", line 164, in _create_tomo_sequence_scan
    )
AttributeError: 'NoneType' object has no attribute 'connect_sinogram_updated'