JWTBearerTokenGenerator.generate - can not able to generate token with expires_in=0

[danilovmy]

authlib\oauth2\rfc7523\token.py

def generate(self, grant_type, client, user=None, scope=None, expires_in=None):
     if not expires_in:
            expires_in = self.DEFAULT_EXPIRES_IN

it should be:

def generate(self, grant_type, client, user=None, scope=None, expires_in=None):
     if expires_in is None:
            expires_in = self.DEFAULT_EXPIRES_IN