IndexError caused by malformed DNS packet

[readycool]

Stack trace:

File "/opt/homebrew/lib/python3.10/site-packages/spf.py", line 595, in check
  spf = self.dns_spf(self.d)
File "/opt/homebrew/lib/python3.10/site-packages/spf.py", line 1164, in dns_spf
  a = [t for t in self.dns_txt(domain) if RE_SPF.match(t)]
File "/opt/homebrew/lib/python3.10/site-packages/spf.py", line 1219, in dns_txt
  if isinstance(a[0],bytes):
IndexError: list index out of range

Steps to reproduce:

- Python 3.10.4
- dnspython 2.2.1
- pyspf 2.0.14

python spf.py 0.0.0.0 example@openprocurement.io openprocurement.io

DiG 9.10.6 output:

dig openprocurement.io TXT
;; Warning: Message parser reports malformed message packet.
;; WARNING: Message has 11 extra bytes at end