Minor cleanup

Author: dandavison

openai_agents/workflows/research_agents/research_manager.py

@@ -46,16 +46,13 @@ async def _plan_searches(self, query: str) -> WebSearchPlan:
 
     async def _perform_searches(self, search_plan: WebSearchPlan) -> list[str]:
         with custom_span("Search the web"):
-            num_completed = 0
             tasks = [
                 asyncio.create_task(self._search(item)) for item in search_plan.searches
             ]
             results = []
             for task in workflow.as_completed(tasks):
-                result = await task
-                if result is not None:
+                if result := await task:
                     results.append(result)
-                num_completed += 1
             return results
 
     async def _search(self, item: WebSearchItem) -> str | None: