widget filter from integer field (which has no serialize method) give an error

[yougis]

i get an error when I use widget filter from an integer field I get an error during the querying.

It 's caused by this line of code

self.widget.param.value.serialize(self.widget.value)

I propose to change with :

        if not hasattr(self.widget.param.value, 'serialize'):
            return  self.widget.value
        else:
            return self.widget.param.value.serialize(self.widget.value)

to keep the initial serializing with widget that needs to be serialize and render directly the value in the other way.

I do a PR

[github-actions]

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