[FIX] web: fix error on creating new record with ref field

[yelizariev]

STEPS:

• Open Settings >> External Identifiers
• Click [Create]

Patch in getValue fixes js error:

Caused by: TypeError: Cannot read properties of undefined (reading 'model')

Patch in onWillUpdateProps fixes infinite loop

task-3047190 opw-3056362

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:

---

I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

[robodoo]

[yelizariev]

Also, opw-3073516

[yelizariev]

The test is added.

Error without any changes:

(Infinite loop error is not captured)

[mcm-odoo]

@robodoo r+