Add optional column on tree view

issue10989
review374321002

view/order_point_tree.xml

@@ -2,10 +2,10 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree>
+    <field name="company" expand="1" optional="1"/>
     <field name="product" expand="2"/>
     <field name="location" expand="2"/>
     <field name="type"/>
-    <field name="company" expand="1"/>
     <field name="min_quantity" symbol="unit"/>
     <field name="max_quantity" symbol="unit"/>
 </tree>