[FIX] get_name with empty name

models/stock_production_lot.py

@@ -67,6 +67,6 @@ class FumocStockProductionLot(models.Model):
         res = super().name_get()
         if self.env.context.get("show_qty"):
             res = self.browse([r[0] for r in res]).mapped(
-                lambda r: (r.id, r.name + " (en stock : %.0f)" % r.product_qty)
+                lambda r: (r.id, r.name and (r.name + " (en stock : %.0f)" % r.product_qty) or r.name)
             )
         return res