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Allow Zero as valid value in required module param

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I'm trying to create a required backoffice module param which allows zero as valid value.

I set up the field like this

'col' => 2,
'type' => 'text',
'name' => 'PARAM_NAME',
'label' => $this->l('my label'),
'desc' => $this->l('my desc'),
'suffix' => $this->l('sfx'),
'required' => true,

And when I type in 0 and save I get an error message that fill in all required fields.

I could set required to false, but this data is required by an API and if not set it can cause all sorts of problems.

How can I allow zero as valid value?

oh I forgot. I'm using PS

Edited by PisziBp (see edit history)

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