[Core feature] Possibility to check for `None` values

[MartinTschechne]

Motivation: Why do you think this is important?

Additionally to is_true() and is_false() it would be nice to have a functionality to check whether None is returned by a task. This could be useful in conditionals for example.

Goal: What should the final outcome look like, ideally?

The function is_none() should simply return True or False and logically work like

if val is None:
    return True
else:
    return False

Describe alternatives you've considered

Either returning the string 'None' or False and explicitly check for that.

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• [X] Yes

Have you read the Code of Conduct?

• [X] Yes

[welcome[bot]]

Thank you for opening your first issue here! 🛠

[pohanhuang]

Hi @cosmicBboy, can you assign this issue to me? I am interested in this one.

Thanks.

[ananyapillai72]

Hey! would like to work on this

[github-actions[bot]]

Hello 👋, this issue has been inactive for over 9 months. To help maintain a clean and focused backlog, we'll be marking this issue as stale and will engage on it to decide if it is still applicable. Thank you for your contribution and understanding! 🙏

[dwo]

Implemented in flyteorg/flytekit#1757 ?