[FIX] stock: validate inventory

Highlight the 'Validate Inventory' button only if there is at least one
inventory line.

opw-2187225

closes odoo/odoo#44793

X-original-commit: 95da1ac1
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/stock/views/stock_inventory_views.xml

@@ -155,13 +155,15 @@
             <header>
                 <button name="action_start" states="draft" string="Start Inventory" type="object" class="oe_highlight" groups="stock.group_stock_user"/>
                 <button name="action_open_inventory_lines" states="confirm" string="Continue Inventory" type="object" class="oe_highlight" groups="stock.group_stock_user"/>
-                <button name="action_validate" states="confirm" string="Validate Inventory" type="object" class="oe_highlight" groups="stock.group_stock_manager"/>
+                <button name="action_validate" string="Validate Inventory" type="object" attrs="{'invisible': ['|', ('state', '!=', 'confirm'), ('line_ids', '!=', [])]}" groups="stock.group_stock_manager"/>
+                <button name="action_validate" string="Validate Inventory" type="object" attrs="{'invisible': ['|', ('state', '!=', 'confirm'), ('line_ids', '=', [])]}" class="oe_highlight" groups="stock.group_stock_manager"/>
                 <button name="action_cancel_draft" states="cancel" string="Set to Draft" type="object"/>
                 <button name="action_cancel_draft" states="confirm" string="Cancel Inventory" type="object"
                     confirm="If you cancel this inventory adjustment, all its inventory adjustment lines will be lost. Are you sure you want to discard it ?"/>
                 <field name="state" widget="statusbar" statusbar_visible="draft,confirm,done"/>
             </header>
             <sheet>
+                <field name="line_ids" invisible="1"/>
                 <div class="oe_button_box" name="button_box">
                     <button string="Product Moves" type="object"
                             name="action_view_related_move_lines"