[6.15.z] Fix validation: validate IPv6 proxy URL only when IS_IPV6 is set to True #15423
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Cherrypick of PR: #15413
Problem Statement
Using latest robottelo, including the IPv6-related changes, I am running into
This error is caused by a validator that enforces string type, but it is setting the value to None itself. :meow_shrugs:
Solution
Utilize conditional validation - validate the IPv6 proxy URL setting only when IS_IPV6 is set to True
https://www.dynaconf.com/validation/#conditional-validation
Related Issues
This should be fixed before #15289 goes in