CRM_Core_BAO_UFGroup::formatFields should not use uninitialized $primaryEmail

<code>
} else

{ $data['location'][$loc]['email'][$loc]['email'] = $primaryEmail; }
</code>

should be

<code>
} else if (isset($primaryEmail)) { $data['location'][$loc]['email'][$loc]['email'] = $primaryEmail; }

</code>

$primaryEmail is uninitialized if a contact ID isn't passed in.