Fixing None return on

[jaesivsm]

While inquiring the error below, I though _generate_name behavior wasn't the one intended.

>>> apache.ApacheSource(['app.jarr.info:443 192.99.37.47 - - [24/Jan/2023:14:39:41 +0100] "GET / HTTP/2.0" 200 1245 "-" "updown.io daemon 2.9"'], '%v %p %h %l %u %t "%r" %>s %O "%{Referer}i" "%{User-Agent}i"')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/jaes/.cache/pypoetry/virtualenvs/papache-log-parser-hFQMj0L_-py3.10/lib/python3.10/site-packages/lars/apache.py", line 469, in __init__
    self._parse_log_format()
  File "/home/jaes/.cache/pypoetry/virtualenvs/papache-log-parser-hFQMj0L_-py3.10/lib/python3.10/site-packages/lars/apache.py", line 617, in _parse_log_format
    ','.join(tuple_fields))
TypeError: sequence item 1: expected str instance, NoneType found