#3514 [Core feature] Possibility to check for `None` values Issue created by 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? • Yes ### Have you read the Code of Conduct? • Yes flyteorg/flyte