add handle edge cases for sub_agents being null or {}

Author: JubSteven

src/core/orchestrator.py

@@ -767,7 +767,7 @@ async def run_main_agent(
 
         # 2. Get tool definitions
         tool_definitions = await self.main_agent_tool_manager.get_all_tool_definitions()
-        if self.cfg.sub_agents is not None:
+        if self.cfg.sub_agents is not None and self.cfg.sub_agents:
             tool_definitions += expose_sub_agents_as_tools(self.cfg.sub_agents)
         if not tool_definitions:
             logger.debug(

src/core/pipeline.py

@@ -86,7 +86,7 @@ async def execute_task_pipeline(
 
         # Initialize sub agent LLM client
         # Require agent-specific LLM configuration for sub-agents
-        if cfg.sub_agents:
+        if cfg.sub_agents is not None and cfg.sub_agents:
             first_sub_agent = next(iter(cfg.sub_agents.values()))
             if hasattr(first_sub_agent, "llm") and first_sub_agent.llm is not None:
                 sub_agent_llm_client = LLMClient(
@@ -180,7 +180,7 @@ def create_pipeline_components(cfg: DictConfig, logs_dir: str | None = None):
     )
 
     sub_agent_tool_managers = {}
-    if cfg.sub_agents is not None:
+    if cfg.sub_agents is not None and cfg.sub_agents:
         for sub_agent in cfg.sub_agents:
             sub_agent_mcp_server_configs, sub_agent_blacklist = (
                 create_mcp_server_parameters(cfg, cfg.sub_agents[sub_agent], logs_dir)