message: rpc: add brackets to ConstructTransaction
diff: CMutableTransaction ConstructTransaction(const UniValue& inputs_in, const UniValue& outputs_in, const UniValue& locktime, const UniValue& timestamp)
  {
  - if (outputs_in.isNull())
  + if (outputs_in.isNull()) {
  throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, output argument must be non-null");
  + }
  UniValue inputs;
  - if (inputs_in.isNull())
  + if (inputs_in.isNull()) {
  inputs = UniValue::VARR;
  - else
  + } else {
  inputs = inputs_in.get_array();
  + }
  const bool outputs_is_obj = outputs_in.isObject();
  UniValue outputs = outputs_is_obj ? outputs_in.get_obj() : outputs_in.get_array();
  