[FIX] stock_valuation_fifo_lot

This commit fixes the incorrect stock_valuation_layer values for deliveries when the product was received before this module was installed.
The issue occurs because the old stock_valuation_layer records do not have lot_ids values, which leads to incorrect valuation during the delivery process.
Issue link: #1350 (comment)

stock_valuation_fifo_lot/models/product.py

@@ -47,6 +47,12 @@ def _run_fifo(self, quantity, company):
             candidates = self._get_fifo_candidates(company).filtered(
                 lambda l: move_line.lot_id in l.lot_ids
             )
+            # Find incoming stock valuation layers that don't have lot_ids
+            # It may happen that the stock was received before installing this module
+            if not candidates:
+                candidates = self._get_fifo_candidates(company).filtered(
+                    lambda l: move_line.lot_id in l.stock_move_id.lot_ids
+                )
             for candidate in candidates:
                 qty_taken_on_candidate = min(
                     qty_to_take_on_candidates, candidate.remaining_qty