[FIX] web: prevent virtual datapoint creation when no default value

Previously, it used to create a virtual datapoint even though there was
no change on this field. If the field was a many2one, this datapoint
triggered a name_get call afterwards, but giving the virtual id of
the datapoint since there is no real record. The solution is to avoid
creating a virtual datapoint when it is not needed at all, thus fixing
the wrong name_get call.

Steps to reproduce the bug:
- Enable lots in Iventory
- Choose a product which is a component of another (through mrp bom)
- Set this product as tracked by lot
- Set this product inventory quantity to 0
- Create a new manufacturing order for the product for which it is a
  component
- Click on "Check Availability"
- Click on Produce
- You'll get an error as the web client tries to fetch the name_get of
  this datapoint even though the record does not exist.

0 files changed, 0 insertions, 0 deletions