[FIX] delivery stock_move form, weight alignment

Closes: #954
Avoid false values in calendar views

'false' is displayed when no value is assigne to a field declared in a calend.

Impacted versions:

8.0, master
Steps to reproduce:

Create a fresh database, create a new customer and set his fiscal position.
Create a quotation, select the customer
Current behavior:

File "/Users/keje/src/odoo/addons/account/partner.py", line 107, in get_fiscal_position
return part.property_account_position.id
NameError: global name 'part' is not defined

Expected behavior:

No error
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Do this in both onchange method and invoice creation from picking.
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When an invoice is created from a picking keep a reference to the stock.move to
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This used to be done by the _prepare_invoice_line method but it was removed
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