Event pricing should have a fallback for profiles with no membership assigned

Right now, event pricing is defined per membership type in the Event Setup. If a player profile has no membership assigned, the system does not have a pricing row to apply. In that situation, the event can appear as $0, even if a public or embedded price is configured. This creates an operational risk at the front desk if a profile is accidentally created without a membership. A safeguard — such as a default price or required membership assignment — would help prevent accidental zero‑dollar registrations.