Traceback (most recent call last):
File "/procedure/prozorro_sale/procedure/errors.py", line 75, in request_errors_middleware
return await handler(request)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/auth/__init__.py", line 114, in context_middleware
return await handler(request)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/auth/__init__.py", line 121, in access_middleware
return await check_access(handler)(request)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/auth/__init__.py", line 134, in handler
return await func(request, *args, **kwargs)
File "/procedure/prozorro_sale/procedure/utils.py", line 98, in accept_language_middleware
return await handler(request)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/tools/__init__.py", line 81, in retry_on_concurrency_error_middleware
return await handler(request)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/tools/__init__.py", line 65, in handler
return await func(request, *args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/tools/__init__.py", line 43, in request_unpack_params
return await handler(request, **request.match_info)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/tools/__init__.py", line 106, in handler
return await func(request, *args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/prozorro_sale/tools/__init__.py", line 65, in handler
return await func(request, *args, **kwargs)
File "/procedure/prozorro_sale/procedure/api.py", line 55, in create_procedure
procedure = model_generator.create_procedure(data, _id=blank._id, owner=user.name)
File "/procedure/prozorro_sale/procedure/model_generator.py", line 88, in create_procedure
proc.status = initial_state
File "/usr/local/lib/python3.9/site-packages/schematics/models.py", line 37, in _setter
getattr(self, post_set_callback_name)()
File "/procedure/prozorro_sale/procedure/state_machine/__init__.py", line 25, in _after_status_set
self._load_state(self.status)._on_enter()
File "/procedure/prozorro_sale/procedure/packages/basicSell/states.py", line 65, in _on_enter
self._assign_custom_periods()
File "/procedure/prozorro_sale/procedure/packages/basicSell/states.py", line 44, in _assign_custom_periods
calculator.calculate_period_boundaries_inside_parent(
File "/procedure/prozorro_sale/procedure/calculator.py", line 341, in calculate_period_boundaries_inside_parent
if "open_after_start" in period_spec:
TypeError: argument of type 'NoneType' is not iterable```