Merge JoinMarket-Org/joinmarket-clientserver#1628: Use `get_deser_from_gettransaction()` everywhere

fab97a003b Use get_deser_from_gettransaction() everywhere (Kristaps Kaupe)

Pull request description:

  There's `get_deser_from_gettransaction()` method in `BlockchainInterface` which is wrapper around python-bitcointx `CMutableTransaction.deserialize()` with some error checking added. It is used in most of the code, but in `jmclient/wallet_utils.py` I found two direct calls of `CMutableTransaction.deserialize()`.

Top commit has no ACKs.

Tree-SHA512: c0fc781e37b3bc72e89805e62b594ba879d5c2b84d3417dcefeba4428d21abcf0f44f143c1b9f5cf23a896e03add26b80b9cc514842142b45432c31adf563d7a

src/jmclient/wallet_utils.py

@@ -384,8 +384,8 @@ def get_tx_info(txid: str, tx_cache: Optional[dict] = None) -> Tuple[
         rpctx, rpctx_deser = tx_cache[txid]
     else:
         rpctx = jm_single().bc_interface.get_transaction(txid)
-        txhex = str(rpctx['hex'])
-        rpctx_deser = btc.CMutableTransaction.deserialize(hextobin(txhex))
+        rpctx_deser = jm_single().bc_interface.get_deser_from_gettransaction(
+            rpctx)
         if tx_cache is not None:
             tx_cache[txid] = (rpctx, rpctx_deser)
     output_script_values = {x.scriptPubKey: x.nValue for x in rpctx_deser.vout}
@@ -905,8 +905,8 @@ def wallet_fetch_history(wallet, options):
                 wallet_tx = jm_single().bc_interface.get_transaction(
                     ins.prevout.hash[::-1])
                 if wallet_tx:
-                    wallet_tx_deser = btc.CMutableTransaction.deserialize(
-                        hextobin(wallet_tx['hex']))
+                    wallet_tx_deser = jm_single.bc_interface(
+                        ).get_deser_from_gettransaction(wallet_tx)
                     tx_cache[ins.prevout.hash[::-1]] = (wallet_tx,
                                                         wallet_tx_deser)
             if wallet_tx is None: