don't insert unnecessary NUL byte in coinbase script when not merged mining

diff --git a/p2pool/work.py b/p2pool/work.py
index 5ba9025..8e9c6fa 100644 (file)
--- a/p2pool/work.py
+++ b/p2pool/work.py
@@ -187,7 +187,7 @@ class WorkerBridge(worker_interface.WorkerBridge):
                     previous_share_hash=self.best_share_var.value,
                     coinbase=(script.create_push_script([
                         self.current_work.value['height'],
-                        mm_data,
+                        ] + ([mm_data] if mm_data else []) + [
                     ]) + self.current_work.value['coinbaseflags'])[:100],
                     nonce=random.randrange(2**32),
                     pubkey_hash=pubkey_hash,