#427 Add the scalar to the operand Pull request opened by pingsutw TL;DR Adding the scalar to the operand gives Propeller the ability to 1. Check if the input value is None 2. Compare two structured Dataset schemas 3. Compare two file paths 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 ^^^ Tracking Issue flyteorg/flyte#3514 Follow-up issue NA flyteorg/flyteidl ✅ All checks have passed 13/13 successful checks