fix(pipelinesascode): Fix validating-webhook panic when PAC Settings is nil (PAC disabled). - #4195

Process completed with exit code 1.

Unexpected input(s) 'token', valid inputs are ['version', 'sha256sum', 'coverage-artifact-name', 'coverage-file-name', 'root-package', 'skip-comment', 'trim', 'exclude', 'github-baseline-workflow-ref', 'event-name', 'target-branch']