[FIX] mrp: MO with a serial numbers

Steps to reproduce:

1. Create two products A and B that require a serial number
2. Create a product C with no trcking
3. Create a BOM for a A with two components B an C
4. Create a MO for A with  qty > 1
5. Check availabiltity and produce the first A
6. Record the SN for the first assembly

Bug: When producing the second assembly, it was not possible to
record the SN for the components.

opw:741316

addons/mrp/wizard/mrp_product_produce.py

@@ -29,7 +29,7 @@ class MrpProductProduce(models.TransientModel):
             lines = []
             existing_lines = []
             for move in production.move_raw_ids.filtered(lambda x: (x.product_id.tracking != 'none') and x.state not in ('done', 'cancel')):
-                if not move.move_lot_ids:
+                if not move.move_lot_ids.filtered(lambda x: not x.lot_produced_id):
                     qty = quantity / move.bom_line_id.bom_id.product_qty * move.bom_line_id.product_qty
                     if move.product_id.tracking == 'serial':
                         while float_compare(qty, 0.0, precision_rounding=move.product_uom.rounding) > 0: