[4.0] More flexible and null value aware datetime range filter in articles model

[richard67]

Pull Request for Issue # .

Summary of Changes

Follow up to PR #26295 , which introduced real NULL values for datetime columns in com_content's database table.

Extends the range filter for datetimes in the articles model (frontend) so that

1. One of the parameters start and end of the range may be ommitted.
2. The date to be filtered might be a real NULL value. The filter query will handle that.

Testing Instructions

Code review, or use that datetime filtering of the frontend articles model somewhere.

Expected result

See summary of changes.

Actual result

None of that.

Documentation Changes Required

None as far as I can see.

[richard67]

@wilsonge Does it need to write testing instructions? Those are the only reason why it is still draft/WiP. I can write tomorrow if necessary. Or would "code review" be enough?

[richard67]

@SharkyKZ Done. Thanks for the elegant solution you've proposed. I did it that way.

[wilsonge]

Thanks!