Jack 3eff41361b fix: prevent None values in auto-metadata from causing KeyError (#15842) ...

## Problem

When users configure auto-metadata for a dataset, parsing crashes with:

```
KeyError: 'properties' in gen_metadata → schema["properties"]
```

## Root Cause

Pydantic `AutoMetadataField` defaults `enum` and `description` to `None`
when the frontend omits these fields:

```python
class AutoMetadataField(Base):
    enum: Annotated[list[str] | None, Field(default=None)]
    description: Annotated[str | None, Field(default=None)]
```

These `None` values propagate through the call chain and cause two
crashes:

2026-06-09 19:10:48 +08:00

38 KiB

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