change retriever message flow

app.py

@@ -146,6 +146,16 @@ def retriever(query: str, selected_retriever: str):
             retriever_endpoint = "ft"
         else:
             message = "No retriever selected. Skipping document retrieval."
+            retriever_endpoint = "None"
+
+        for chunk in message.split():
+            text += chunk + " "
+            time.sleep(0.05)
+            # Add a blinking cursor to simulate typing
+            placeholder.markdown(text + "▌")
+        placeholder.markdown(text)
+
+        if retriever_endpoint == "None":
             return ""
 
         headers = {
@@ -166,12 +176,6 @@ def retriever(query: str, selected_retriever: str):
 
         corpus = '\n\n'.join(topk_documents)
 
-        for chunk in message.split():
-            text += chunk + " "
-            time.sleep(0.05)
-            # Add a blinking cursor to simulate typing
-            placeholder.markdown(text + "▌")
-        placeholder.markdown(text)
     # You could return retrieved info here.
     return corpus