Add explicit check for name not None (#9265)

Author: maneesh29s

distributed/tests/test_worker.py

@@ -2147,6 +2147,16 @@ def get_thread_name():
         result = await c.gather(c.submit(get_thread_name, pure=False))
         assert "WorkerName-Dask-Default-Threads" in result
 
+    # LocalCluster by default assigns numbers starting from zero
+    # as the worker names
+    async with Worker(
+        s.address,
+        nthreads=1,
+        name=0,
+    ):
+        result = await c.gather(c.submit(get_thread_name, pure=False))
+        assert "0-Dask-Default-Threads" in result
+
     async with Worker(
         s.address,
         nthreads=1,

distributed/worker.py

@@ -615,7 +615,7 @@ def __init__(
 
         self.name = name
 
-        executor_pool_prefix = f"{self.name}-" if self.name else ""
+        executor_pool_prefix = f"{self.name}-" if self.name is not None else ""
         # Common executors always available
         self.executors = {
             "offload": utils._offload_executor,