Disable Invite Users button on organisation page until email address is entered

[TheSussex]

What

When a producer clicks on theInvite Users button without entering any email in the form, it redirects to the home page

Steps to reproduce the behavior

1. Go to 'https://world.pro.openfoodfacts.org/'
2. Log in to with you producer details
3. Click on the dropdown beside the User's name in the far right and select 'Edit your organisation profile'
4. Click on the Invite Users button without entering any email address in the box, it will redirect you to the organisation's home page.

Here is a link to the conversation on Slack.

Expected behavior

The Invite Users button should be disabled until at least one email address has been entered.

Why

This will help improve user experience because with the current flow, the producer might not know that no action was performed.

Type of device

Browser: Google Chrome (Version 123.0.6312.87)