Teardown on unhandled exceptions by work (#1406)

Author: abhinavsingh

proxy/core/work/threadless.py

@@ -370,6 +370,8 @@ async def _run_once(self) -> bool:
             work_id = task._work_id     # type: ignore
             try:
                 teardown = task.result()
+            except Exception:
+                teardown = True
             finally:
                 if teardown:
                     self._cleanup(work_id)