Change behavior of date formatters

[michael-rubel]

About

When we're working with date/datetime formatters, we need to make sure the date is not null. Otherwise, the format helper returns the current date. It is considered wrong behavior because most times current date is unexpected by the developer.

This PR changes the date formatters, so all null and empty values are now handled by returning null by the format helper.

Before:

! empty($datetime) ? format('date', $datetime) : __('No data')

After:

format('date', $datetime) ?? __('No data')

This change is breaking, so it'll be published at the v5 of the package.