[FIX] mrp.bom: wrong check for bom_find. If the user defined a bom line type phantom to a product without bom the check is wrong to display the error message.
Merge pull request #344 from odoo-dev/saas-5-fix-mrp.bom-wrong-bom_find-check-chm

[FIX] mrp.bom: wrong check for bom_find.

If the user defined a bom line type phantom to a product without bom the check is wrong to display the error message.