Fix parsing of multiple asset that has an empty asset name in Ogmios (#238)

Author: cffls

pycardano/backend/ogmios.py

@@ -403,7 +403,15 @@ def _check_utxo_unspent(self, tx_id: str, index: int) -> bool:
         return len(results) > 0
 
     def _extract_asset_info(self, asset_hash: str) -> Tuple[str, ScriptHash, AssetName]:
-        policy_hex, asset_name_hex = asset_hash.split(".")
+        split_result = asset_hash.split(".")
+
+        if len(split_result) == 1:
+            policy_hex, asset_name_hex = split_result[0], ""
+        elif len(split_result) == 2:
+            policy_hex, asset_name_hex = split_result
+        else:
+            raise ValueError(f"Unable to parse asset hash: {asset_hash}")
+
         policy = ScriptHash.from_primitive(policy_hex)
         asset_name = AssetName.from_primitive(asset_name_hex)
 

test/pycardano/backend/test_ogmios.py

@@ -76,6 +76,7 @@
                     "126b8676446c84a5cd6e3259223b16a2314c5676b88ae1c1f8579a8f.744d494e": 762462,
                     "57fca08abbaddee36da742a839f7d83a7e1d2419f1507fcbf3916522.43484f43": 9945000,
                     "fc3ef8db4a16c1959fbabfcbc3fb7669bf315967ffef260ececc47a3.53484942": 1419813131821,
+                    "fc3ef8db4a16c1959fbabfcbc3fb7669bf315967ffef260ececc47a3": 1234,
                 },
             },
             "datum": None,
@@ -194,7 +195,8 @@ def test_utxo(self, chain_context):
                     "43484f43": 9945000
                 },
                 "fc3ef8db4a16c1959fbabfcbc3fb7669bf315967ffef260ececc47a3": {
-                    "53484942": 1419813131821
+                    "53484942": 1419813131821,
+                    b"": 1234,
                 },
             }
         )