Scan fails if Out of Scope subdomain is not supplied

[yogeshojha]

File "/usr/local/lib/python3.8/dist-packages/celery/app/trace.py", line 450, in trace_task
celery_1       |     R = retval = fun(*args, **kwargs)
celery_1       |   File "/usr/local/lib/python3.8/dist-packages/celery/app/trace.py", line 731, in __protected_call__
celery_1       |     return self.run(*args, **kwargs)
celery_1       |   File "/usr/src/app/reNgine/tasks.py", line 149, in initiate_scan
celery_1       |     subdomain_scan(
celery_1       |   File "/usr/src/app/reNgine/tasks.py", line 481, in subdomain_scan
celery_1       |     ) and validators.domain(__subdomain) and __subdomain not in out_of_scope_subdomains:
celery_1       | TypeError: argument of type 'NoneType' is not iterable