Cannot blacklist AZ usw1-az2 and apne1-az3

[filuta]

Describe the bug
When I blacklist availability zones usw1-az2 and apne1-az3 (via az_blacklist), validation of templates with taskcat lint fails (the output), because it doesn't match the regex. But without blacklisting the two AZs, my test fails in regions us-west-1 and ap-northeast-1, because the instance type I'm using (m5d.xlarge) is not available in usw1-az2 and apne1-az3 (one of the logs).

To Reproduce

4. How did you install taskcat? (docker or pip3)
   pip3
5. Are you using a profile, an instance role or access keys to run taskcat?
   profile
6. Is your AWS environment configured via aws configure?
   yes

Expected behavior
It is possible to blacklist availability zones usw1-az2 and apne1-az3

Version

• Taskcat Version 0.9.41
• Python Version 3.10.12

Additional context
It was possible to blacklist the AZs in older versions of taskcat (we were using version 0.9.19). I think it stopped working after these changes were merged.
Taskcat config file