Add client side validation for lists still being uploaded
Add client side validation for lists still being uploaded

Prevents the user from creating a campaign with a list that
has not yet been fully uploaded/processed.

zhakkarn/Mail-for-Good,karuppiah7890/Mail-for-Good,karuppiah7890/Mail-for-Good,zhakkarn/Mail-for-Good,karuppiah7890/Mail-for-Good,zhakkarn/Mail-for-Good