Blueprint compile failure with empty FTimerHandle return value

Blueprint compile failure when returning a Timer Handle from a function call when the Timer Handle node is not connected.

Compile failure message: "ICE: The type of property %s doesn't match a term."

Regression:
Yes - Repro steps provided will compile successfully in 4.14.3 (CL 3249277)
Repro steps do not compile in 4.15.3 (CL 3450819)

1. Open UE4 Editor (any project)
2. Create Blueprint based on actor
3. Add new function to blueprint
4. Give the new function an output of type Timer Handle
5. Compile blueprint

Result:
Blueprint fails to compile with error message in Description

Fix UE-51650

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