simplify select url logic

miles/router/diffusion_router.py

@@ -115,14 +115,12 @@ def _use_url(self):
         """Select worker URL with minimal active requests."""
         if not self.worker_request_counts:
             raise RuntimeError("No workers registered in the pool")
-        if not self.dead_workers:
-            url = min(self.worker_request_counts, key=self.worker_request_counts.get)
-        else:
-            valid_workers = (w for w in self.worker_request_counts if w not in self.dead_workers)
-            try:
-                url = min(valid_workers, key=self.worker_request_counts.get)
-            except ValueError:
-                raise RuntimeError("No healthy workers available in the pool") from None
+
+        valid_workers = (w for w in self.worker_request_counts if w not in self.dead_workers)
+        try:
+            url = min(valid_workers, key=self.worker_request_counts.get)
+        except ValueError:
+            raise RuntimeError("No healthy workers available in the pool") from None
 
         self.worker_request_counts[url] += 1
         return url