"Use of uninitialized value" messages

[richlv]

Describe the bug Running dmarc_receive against a file prints a bunch "Use of uninitialized value" messages. Unfortunately, the input file cannot be shared - but perhaps the messages allow to identify where validation might be useful.

Use of uninitialized value in lc at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 227.

Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 142.
Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 143.
Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 148.
Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 156.
Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 156.
Use of uninitialized value $c_type in string eq at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 163.
Use of uninitialized value $c_type in concatenation (.) or string at /usr/lib/perl5/site_perl/5.40.0/Mail/DMARC/Report/Receive.pm line 181.
Unknown message part

Server (please complete the following information):

• OS: OpenSUSE
• Version Tumbleweed

Perl (please complete the following information):

• Version 5.40.0