Merge pull request #54 from opentensor/fix/decoding-empty-change-data

Handles None change_data

Author: ibraheem-abe

async_substrate_interface/async_substrate.py

@@ -892,6 +892,8 @@ async def decode_scale(
         Returns:
             Decoded object
         """
+        if scale_bytes == b"":
+            return None
         if type_string == "scale_info::0":  # Is an AccountId
             # Decode AccountId bytes to SS58 address
             return ss58_encode(scale_bytes, SS58_FORMAT)
@@ -2230,7 +2232,7 @@ async def query_multi(
                 # Decode result for specified storage_key
                 storage_key = storage_key_map[change_storage_key]
                 if change_data is None:
-                    change_data = b"\x00"
+                    change_data = b""
                 else:
                     change_data = bytes.fromhex(change_data[2:])
                 result.append(