[FIX] mrp_account: fix reference to a deleted bom line

- Enable Margin analysis
- Have a product [TEST] in a category with
  - FIFO and Automated Valuation.
  - Kit BOM with 3 items (A,B,C)
- Create a SO with [TEST] and confirm.
- Modify the BOM and remove C from the kit.
- Back to the SO, cancel it.

Traceback will show, because there no more a bom_line associated with
the move

opw-2541674

closes odoo/odoo#72696

X-original-commit: 27821b728f409d7e1a69e84d0beb5ac708e6420e
Signed-off-by: agr-odoo <agr-odoo@users.noreply.github.com>

addons/mrp_account/models/product.py

@@ -52,9 +52,13 @@ class ProductProduct(models.Model):
         value = 0
         for move in stock_moves:
             bom_line = move.bom_line_id
-            bom_line_data = bom_lines[bom_line]
-            bom_line_qty = bom_line_data['qty']
-            value += bom_line_qty * move.product_id._compute_average_price(qty_invoiced * bom_line_qty, qty_to_invoice * bom_line_qty, move)
+            if bom_line:
+                bom_line_data = bom_lines[bom_line]
+                line_qty = bom_line_data['qty']
+            else:
+                # bom was altered (i.e. bom line removed) after being used
+                line_qty = move.product_qty
+            value += line_qty * move.product_id._compute_average_price(qty_invoiced * line_qty, qty_to_invoice * line_qty, move)
         return value
 
     def _compute_bom_price(self, bom, boms_to_recompute=False):