Pass RpcException error data through if it's not a map.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//224903010

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/json_rpc_2@34748 260f80e4-7a28-3924-810f-c04153c831b5
6 files changed
tree: 9bc82908e4be821b535c7b2efd0cead500026f39
  1. pkgs/