fixed None Type is not iterable errors when type is list | None

[mr-pmillz]

This resolves panics that occur from TypeError's when attempting to use the .extend method on None type objects.

[*] crt: Performing Crt.sh Search Enumeration against example.com...
[-] Bad http status from crt.sh: "503"
Traceback (most recent call last):
  File "/root/test/dnsrecon/bin/dnsrecon", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/root/test/dnsrecon/lib/python3.11/site-packages/dnsrecon/cli.py", line 1956, in main
    returned_records.extend(crt_enum_records)
TypeError: 'NoneType' object is not iterable

[L1ghtn1ng]

Can you make sure your quotes are single ones please to pass the formatter ci check

[mr-pmillz]

Can you make sure your quotes are single ones please to pass the formatter ci check

Whoops, yep no prob 👍

[L1ghtn1ng]

Thanks for this