gliffcheung

### Describe your problem refer [code](https://github.com/infiniflow/ragflow/blob/v0.12.0/api/db/services/dialog_service.py#L194). ```python if not llm: llm = TenantLLMService.query(tenant_id=dialog.tenant_id, llm_name=llm_id) if not fid else \ TenantLLMService.query(tenant_id=dialog.tenant_id, llm_name=llm_id, llm_factory=fid) if not llm: raise LookupError("LLM(%s) not found" %...