[Lock 10.5.0] Prefill fails when using username

[CriGoT]

Username prefill for username is not working in Lock 10.3, 10.4 and 10,.5. The problem si simple to reproduce

const cid = "ob7ZFXdikBMSFLWm0QzXzgv1CFeHuUiu";
const domain = "crigot-dev.auth0.com";
const options = {prefill:{username:'user'}};
const lock = new Auth0Lock(cid, domain, options);
lock.show();

The error is the following and points here

username.js:36Uncaught TypeError: Cannot read property 'getIn' of undefined
    at getUsernameValidation (http://localhost:3000/lock.js:43511:64)
    at setUsername (http://localhost:3000/lock.js:43519:53)
    at Classic.didInitialize (http://localhost:3000/lock.js:41436:73)
    at Auth0Lock.runHook (http://localhost:3000/lock.js:38894:41)
    at Object.runHook (http://localhost:3000/lock.js:39953:31)
    at setupLock (http://localhost:3000/lock.js:38956:9)
    at Auth0Lock.Base (http://localhost:3000/lock.js:38754:28)
    at new Auth0Lock (http://localhost:3000/lock.js:44096:51)
    at http://localhost:3000/:19:18

It seems that prefill is trying to use validation information about the connections before initializing the model. Since this value is passed by the user maybe validation can be skipped for this value.

    if (typeof username === "string") model = setUsername(model, username, null, false);

Otherwise, this has to be relocated to another stage where the database information is available.