Should the default policy be invoked when trusted types are not required?

[mbrodesser-Igalia]

https://w3c.github.io/trusted-types/dist/spec/#get-trusted-type-compliant-string-algorithm step 3 returns if no trusted types are required.

That section is normative. The non-normative section about the default policy (https://w3c.github.io/trusted-types/dist/spec/#default-policy-hdr) doesn't mention that aspect.

It seems more intuitive to invoke the default policy.