Add release note, address feedback

ethereum · Nov 8, 2019 · c268b87 · c268b87
1 parent e28e746
commit c268b87
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diff --git a/newsfragments/1255.bugfix.rst b/newsfragments/1255.bugfix.rst
@@ -0,0 +1 @@
+Make local block filter return empty list when when no blocks mined
diff --git a/web3/middleware/filter.py b/web3/middleware/filter.py
@@ -277,7 +277,7 @@ def get_filter_changes(self):
 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
+        return
     for block_number in range(from_block, to_block + 1):
         yield getattr(w3.eth.getBlock(block_number), 'hash', None)