fix(core): Handle empty external schema fields #3329
Merged
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Tracking issue
NA
Why are the changes needed?
Handle empty external schema fields
What changes were proposed in this pull request?
set external schema fields to None if the fields are none in proto
How was this patch tested?
unit test
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Summary by Bito
This pull request fixes a bug in the Flytekit library by ensuring empty external schema fields are set to None when not provided. It also adds a unit test to verify the handling of optional structured datasets, improving the type engine's robustness.