[FIX] product: check if context is none in _set_standard_price before check context keys
[FIX] product: set required at false for product template field when creating a product product.
[FIX] product: remove wrong field on product.template. TODO: move packaging field form product.product to product.template
Merge pull request #298 from odoo-dev/saas-5-fixes-product-chm

[FIX] product
Context in _set_standard_price and many2one in product.packaging;
Set required at false for product template field when creating a product product;
Remove wrong field on product.template. TODO: move packaging field form product.product to product.template