There's a recent entry in the 2.6 branch from fred stating:

        types don't have a guaranteed truth value, so check that it
        isn't None

the diff is here:

This same fix needs to be applied to at least the 2.7 branch and HEAD,
probaly other branches too, but I haven't checked.

Should I file a bug for this?

Cheers, Leo

Ideas don't stay in some minds very long because they don't like
solitary confinement.

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