#1747 Add is none function Pull request opened by hhcs9527 on <!date^1689644095^{date_short}|2023-07-18T01:34:55Z> TL;DR Please replace this text with a description of what this PR accomplishes. Type ☐ Bug Fix ☐ Feature ☐ Plugin Are all requirements met? ☐ Code completed ☐ Smoke tested ☐ Unit tests added ☐ Code documentation added ☐ Any pending items have an associated Issue Complete description How did you fix the bug, make the feature etc. Link to any design docs etc Tracking Issue https://github.com/flyteorg/flyte/issues/ Follow-up issue NA OR https://github.com/flyteorg/flyte/issues/ flyteorg/flytekit ✅ All checks have passed 30/30 successful checks