PyJWKSet reports the wrong exception for an empty key set

[lbam]

Empty key sets give the wrong exception. The error is here:

pyjwt/jwt/api_jwk.py

Lines 80 to 84 in 24b29ad

	if not keys or not isinstance(keys, list):
	raise PyJWKSetError("Invalid JWK Set value")
	if len(keys) == 0:
	raise PyJWKSetError("The JWK Set did not contain any keys")

When keys is the empty list, not keys is true so the second check is never reached (unless some list subclass overrides __bool__).

Expected Result

Should raise PyJWKSetError("The JWK Set did not contain any keys").

Actual Result

Raises PyJWKSetError("Invalid JWK Set value").

Reproduction Steps

import jwt
jwt.PyJWKSet.from_dict({"keys": []})

[jpadilla]

probably fixed by #762

[lbam]

Not fixed. #762 changes code beyond the point where this exception occurs. Would you please reopen the issue?

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days