How an empty condition in the "not" condition should be handled?

[yoshisatoyanagisawa]

If "not" condition gets an empty condition, i.e. {}, how should it be handled?
I suppose options are:

1. raise.
2. treat it as always true.

We used to treat an empty list to "or" condition as always false. However, I suppose it fine to raise.
What do others think?

[yoshisatoyanagisawa]

@domenic @azaika I guess you have opinions in this area.

[azaika]

IMO, raising is the good option.
The "or" condition allows empty lists because they are naturally considered logical identity, and this does not fits to the "not".

[domenic]

I agree with @azaika

[yoshisatoyanagisawa]

Thank you for sharing your opinions, both. Raising sounds the way to go.
However, to gather opinions from others, let me leave the github issue open for several weeks before making the final decision.

[yoshisatoyanagisawa]

Drafted the PR in w3c/ServiceWorker#1711

[yoshisatoyanagisawa]

Two weeks have passed. It might be fine to close this.
No contents in the "not" condition is error.

[yoshisatoyanagisawa]

Please feel free to leave comments in the spec PR by the way.