Clarify comment for server_name fallback logic

Co-authored-by: pontemonti <7850950+pontemonti@users.noreply.github.com>

Author: Copilot

libraries/microsoft-agents-a365-tooling-extensions-agentframework/microsoft_agents_a365/tooling/extensions/agentframework/services/mcp_tool_registration_service.py

@@ -96,7 +96,7 @@ async def add_tool_servers_to_agent(
 
             # Add servers as MCPStreamableHTTPTool instances
             for config in server_configs:
-                # Use mcp_server_name if available, otherwise fall back to mcp_server_unique_name
+                # Use mcp_server_name if available (not None or empty), otherwise fall back to mcp_server_unique_name
                 server_name = config.mcp_server_name or config.mcp_server_unique_name
 
                 try: