[FIX] get required attributes right for companies and non-companies

partner_firstname/partner_view.xml

@@ -6,11 +6,11 @@
       <field name="inherit_id" ref="base.view_partner_simple_form"/>
       <field name="arch" type="xml">
         <field name="name" position="attributes">
-            <attribute name="attrs">{'readonly': [('is_company', '=', False)]}</attribute>
+            <attribute name="attrs">{'readonly': [('is_company', '=', False)], 'required': [('is_company', '=', True)]}</attribute>
         </field>
         <field name="category_id" position="before">
           <group attrs="{'invisible': [('is_company', '=', True)]}">
-            <field name="lastname"/>
+              <field name="lastname" attrs="{'required': [('is_company', '=', False)]}"/>
             <field name="firstname" />
           </group>
         </field>
@@ -23,11 +23,11 @@
       <field name="inherit_id" ref="base.view_partner_form"/>
       <field name="arch" type="xml">
         <field name="name" position="attributes">
-            <attribute name="attrs">{'readonly': [('is_company', '=', False)]}</attribute>
+            <attribute name="attrs">{'readonly': [('is_company', '=', False)], 'required': [('is_company', '=', True)]}</attribute>
         </field>
         <field name="category_id" position="before">
           <group attrs="{'invisible': [('is_company', '=', True)]}">
-            <field name="lastname"/>
+            <field name="lastname" attrs="{'required': [('is_company', '=', False)]}"/>
             <field name="firstname"/>
           </group>
         </field>