53c59c47a1
### What problem does this PR solve?
When updating a chat assistant using API,if the dataset attached by the
current chat assistant is not empty，setting dataset to
null("dataset_ids":[]) will cause update failure：'dataset_ids' can't be
empty
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
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| .. | ||
| agent.py | ||
| chat.py | ||
| dataset.py | ||
| dify_retrieval.py | ||
| doc.py | ||
| session.py | ||