### What problem does this PR solve?
When the `dataset_ids` parameter is omitted in the **update assistant**
request, Passing an empty array `[]` triggers a misleading
message"Dataset use different embedding models", while omitting the
field does not.
To fix this, we:
- Provide a default empty list: `ids = req.get("dataset_ids", [])`.
- Replace the `is not None` check with a truthy check: `if ids:`.
**Files changed**
`api/apps/sdk/chat.py`
- L153: `ids = req.get("dataset_ids")` → `ids = req.get("dataset_ids",
[])`
- L156: `if ids is not None:` → `if ids:`
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
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| .. | ||
| apps | ||
| db | ||
| utils | ||
| __init__.py | ||
| constants.py | ||
| ragflow_server.py | ||
| settings.py | ||
| validation.py | ||
| versions.py | ||