Add Project Member fails silently when no member is selected

[maxsokolovsky]

Setup

• Rancher version: v2.6.3-patch1 and v2.6-head (e4af246)
• Browser type & version: Firefox 98

Describe the bug
If a user tries to add a project member without selecting a member, there is a JS error but no visual error in the UI.

To Reproduce

1. Edit a Project's config.
2. Click Add to bring up the Add Project Member dialog.
3. Do not select a member, just click Add (select any permissions you want).

Result
Nothing, the form is not submitted but shows no errors, which is not intuitive.
There is an error in the browser's console:

TypeError: r is undefined
    e Ember
    d runtime.js:45
    _invoke runtime.js:274
    e runtime.js:97
    Babel 6
    Ember 2
    d runtime.js:45
    _invoke runtime.js:274
    e runtime.js:97
    Babel 4
    Ember 2
    d runtime.js:45
    _invoke runtime.js:274
    e runtime.js:97
    Babel 4
    apply Ember
    VueJS 33

Expected Result

An error is shown saying that a member must be selected.

Screenshots

Additional context

Detailed Description

Context