New ir_property line to every object even if there is a generic value defined

[Eetu Salpaharju]

If you define a generic value for a property field and then create new object, new lines to ir_property -table is created.

This seems to be a bug, expected behaviour would be read a value for a property-field from generic value. Current behaviour causes problem if you want to change your generic value. Then the change will affect only to objects created after the change, not all objects using the generic property value.

On the other hand, now there is unnecessarily many lines in ir_property -table. In my installation there is 80k products in the database and six companies in multicompany system. That cause something like 1M lines into the ir_property table.