Nmap port scan fails when Naabu return no port

[psyray]

While launching a port scan with Naabu + Nmap, I experienced a crash if Naabu returns no port

rengine-celery-1       | nmap                               | ERROR | 'NoneType' object is not subscriptable
rengine-celery-1       | Traceback (most recent call last):
rengine-celery-1       |   File "/usr/src/app/reNgine/celery_custom_task.py", line 129, in __call__
rengine-celery-1       |     self.result = self.run(*args, **kwargs)
rengine-celery-1       |   File "/usr/src/app/reNgine/tasks.py", line 1481, in nmap
rengine-celery-1       |     vulns = parse_nmap_results(output_file_xml, output_file)
rengine-celery-1       |   File "/usr/local/lib/python3.10/dist-packages/celery/local.py", line 182, in __call__
rengine-celery-1       |     return self._get_current_object()(*a, **kw)
rengine-celery-1       |   File "/usr/local/lib/python3.10/dist-packages/celery/app/trace.py", line 761, in __protected_call__
rengine-celery-1       |     return orig(self, *args, **kwargs)
rengine-celery-1       |   File "/usr/local/lib/python3.10/dist-packages/celery/app/task.py", line 411, in __call__
rengine-celery-1       |     return self.run(*args, **kwargs)
rengine-celery-1       |   File "/usr/src/app/reNgine/tasks.py", line 3198, in parse_nmap_results
rengine-celery-1       |     hostnames = [host.get('address')['@addr']]

So I've added a check on empty port scan to prevent Nmap launch

Tested and working on my use case