Bug Report: Unhandled exception "TypeError: sequence item 0: expected str instance, NoneType found" (#664d0717)

[commixreporter]

Commix version: 4.0-dev#112
Python version: 3.12.7
Operating system: posix
Command line: commix.py --wizard

Traceback (most recent call last):
  File \"commix.py", line 36, in <module>
    main()
  File \"commix.py", line 31, in main
    import src.core.main
  File \"main.py", line 902, in <module>
    main(filename, url, http_request_method)
  File \"main.py", line 560, in main
    controller.do_check(url, http_request_method, filename)
  File \"controller.py", line 743, in do_check
    perform_checks(url, http_request_method, filename)
  File \"controller.py", line 706, in perform_checks
    data_checks(url, http_request_method, filename, timesec)
  File \"controller.py", line 623, in data_checks
    if post_request(url, http_request_method, filename, timesec) is None:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"controller.py", line 598, in post_request
    found_parameter = parameters.do_POST_check(parameter, http_request_method)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"parameters.py", line 332, in do_POST_check
    parameter = ''.join(checks.check_similarities(_))
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: sequence item 0: expected str instance, NoneType found