[7.0] [account_check_writing] Amount in words and print check button are not shown in "Write Checks" form

Install account_check_writing module and create/validate a supplier check from from Accounting > ?Write Checks"

The amount in words and print check buttons are not shown.

The attrs condition in the inherited view has incorrect condition.

    attrs="{'invisible':[('allow_check','!=',1)]}"

It should be

    attrs="{'invisible':[('allow_check','!=',True)]}"

Unlike python which has True==1, attrs expressions, which are evaluated client-side using undescore.js methods, True!=1.

I think web client should map boolean values to integers in instance.web.form.compute_domain() to maintain consistancy with python expressions.

To find if there are similar issues in other modules, I search using the regex:

    attrs\s*=\s*"[^"]*'!?=',\s*1\s*\)[^"]*"

Only the view sale.view_order_line_form2 has this issue but it is probably a dead view and not used anywhere.