PUT method for unexisting document is not working on the Python-EVE

requirements.txt

eve==0.6.1

run.py

from eve import Eve

if __name__ == "__main__":
    app = Eve()
    app.run()

settings.py

import os

MONGO_HOST = os.environ.get('HOST', '127.0.0.1')
MONGO_PORT = os.environ.get('PORT', 27017)
MONGO_USERNAME = os.environ.get('USERNAME', None)
MONGO_PASSWORD = os.environ.get('PASSWORD', None)
MONGO_DBNAME = os.environ.get('DBNAME', 'foo')

IF_MATCH = False
ITEM_METHODS = ['PUT']
UPSERT_ON_PUT = True

persons = {
    'schema': {
        'firstname': {
            'type': 'string'
        },
        'lastname': {
            'type': 'string'
        }
    }
}

DOMAIN = {
    'persons': persons
}