TxBuilder: add invalid nulldata case

test/fixtures/transaction_builder.json

@@ -115,6 +115,23 @@
             "value": 1000
           }
         ]
+      },
+      {
+        "exception": "nulldata not supported",
+        "inputs": [
+          {
+            "index": 0,
+            "prevTx": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+            "prevTxScript": "OP_RETURN 06deadbeef03f895a2ad89fb6d696497af486cb7c644a27aa568c7a18dd06113401115185474",
+            "privKeys": ["KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73sVHnoWn"]
+          }
+        ],
+        "outputs": [
+          {
+            "script": "OP_DUP OP_HASH160 aa4d7985c57e011a8b3dd8e0e5a73aaef41629c5 OP_EQUALVERIFY OP_CHECKSIG",
+            "value": 1000
+          }
+        ]
       }
     ]
   }