Fix: dataset_ids parameter (#5864)

### What problem does this PR solve?

Fixed  #5839
This PR fix  error code 102, stating dataset_ids is required.

curl --request POST \
     --url http://{address}/api/v1/chats \
     --header 'Content-Type: application/json' \
     --header 'Authorization: Bearer <YOUR_API_KEY>' \
     --data '{
         "name": "test_chat"
     }'
     
     this is not getting datasetids , fix for it. 

file location : sdk\python\ragflow_sdk\ragflow.py

added : "dataset_ids": dataset_list if dataset_list else [],



### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Co-authored-by: Raghav <2020csb1115@iitrpr.ac.in>

api/apps/sdk/chat.py

@@ -31,7 +31,7 @@ from api.utils.api_utils import get_result
 @token_required
 def create(tenant_id):
     req = request.json
-    ids = [i for i in req.get("dataset_ids", []) if i]
+    ids = [i for i in req.get("dataset_ids", []) if i] 
     for kb_id in ids:
         kbs = KnowledgebaseService.accessible(kb_id=kb_id, user_id=tenant_id)
         if not kbs:

sdk/python/ragflow_sdk/ragflow.py

@@ -129,7 +129,7 @@ class RAGFlow:
 
         temp_dict = {"name": name,
                      "avatar": avatar,
-                     "dataset_ids": dataset_list,
+                     "dataset_ids": dataset_list if dataset_list else [],
                      "llm": llm.to_json(),
                      "prompt": prompt.to_json()}
         res = self.post("/chats", temp_dict)