The view.XXX.php files in Modules are optional if no file is present Sugar simply uses the Core file in "include/MVC/View/views/view.edit.php"
you can create a view.edit.php in custom/modules/Campaigns/views/view.edit.php
with this content:
require_once('include/MVC/View/views/view.edit.php');
class CampaignsViewEdit extends ViewEdit {
function CampaignsViewEdit(){
parent::ViewEdit();
}
function display() {
parent::display();
}
}