> Use a test like this:
>
> if not values.get('number'):
> …
Ok, working
> The constraint on removing "NOT NULL" only by the original module is
> there on purpose because once a field is required all depending code
> will not manage the case if it is empty. So we must ensure that there
> will be always a value.
> Also it is the reason why we must be careful when setting a field
> required.
Ok, the above test is enough for me and thus no need to change the required
field. Thanks!
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