Error if warehouse is not set for checking quantities when quoting sale
With module sale_stock_quantity, there's an error when trying to quote a sale without warehouse. (https://hg.tryton.org/modules/sale_stock_quantity/file/tip/sale.py#l133) Checking quantity should be done after the method check_for_quotation: https://hg.tryton.org/modules/sale/file/tip/sale.py#l762 but before setting sale_number.