return empty list when no blocks mined

ethereum · Feb 23, 2019 · 4fb4d01 · 4fb4d01
1 parent dfeaac6
commit 4fb4d01
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/web3/middleware/filter.py b/web3/middleware/filter.py
@@ -277,6 +277,8 @@ def get_filter_changes(self):
 @to_list
 def block_hashes_in_range(w3, block_range):
     from_block, to_block = block_range
+    if from_block is None or to_block is None:
+        return None
     for block_number in range(from_block, to_block + 1):
         yield getattr(w3.eth.getBlock(block_number), 'hash', None)