remove pylint issues

Author: NirajC-Microsoft

src/backend/v3/callbacks/response_handlers.py

@@ -17,21 +17,23 @@
     WebsocketMessageType,
 )
 
+
 def clean_citations(text: str) -> str:
     """Remove citation markers from agent responses while preserving formatting."""
     if not text:
         return text
-    
+
     # Remove citation patterns like [9:0|source], [9:1|source], etc.
     text = re.sub(r'\[\d+:\d+\|source\]', '', text)
-    
-    #Remove other common citation pattern
+
+    # Remove other common citation pattern
     text = re.sub(r'\[\s*source\s*\]', '', text, flags=re.IGNORECASE)
     text = re.sub(r'\[\d+\]', '', text)
     text = re.sub(r'【[^】]*】', '', text)  # Unicode brackets
     text = re.sub(r'\(source:[^)]*\)', '', text, flags=re.IGNORECASE)
     text = re.sub(r'\[source:[^\]]*\]', '', text, flags=re.IGNORECASE)
-    
+
+
     return text
 
 def agent_response_callback(message: ChatMessageContent, user_id: str = None) -> None:
@@ -96,7 +98,7 @@ async def streaming_agent_response_callback(
             try:
                 message = AgentMessageStreaming(
                     agent_name=streaming_message.name or "Unknown Agent",
-                    content=clean_citations(streaming_message.content),
+                    content=clean_citations(streaming_message.content) or "",
                     is_final=is_final,
                 )
                 await connection_config.send_status_update_async(