Optimized Python silently drops empty tuples

### Feature Summary

Tuple construction rejects empty values with an assert. Optimized Python removes that guard, accepts an empty output tuple, and table conversion silently turns the one output row into zero rows.

Before: empty tuple in optimized Python -> zero pandas and Arrow rows

After: empty tuple in every Python mode -> ValueError

Reproduction evidence:

Run optimized Python, construct an empty Tuple, then build a Table and Arrow table from it.

Version and commit evidence:

1.3.0-incubating-SNAPSHOT (main)

**Commit Hash**

70c21145887920528d7d5540e3fb790b43e8b759

**What browsers are you seeing the problem on?**

Not browser-specific.

**Relevant log output**

```text
optimized= True
tuple_fields= 0
pandas_rows= 0
arrow_rows= 0
error_raised= False
```

### Proposed Solution or Design

After: empty tuple in every Python mode -> ValueError

### Affected Area

Workflow Engine (Amber)