[FIX] event: take contact data when changing contact

registration.onchange_partner_id() method updates registration contact data
(phone, email, name) based on the partner_id field. However the onchange
currently works only when no existing contact data is stored on the
registration. A second change of partner_id does not update the contact
data.

The condition is now inversed. This way when changing the partner, if it
has valid contact data, it will replace existing information.

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