Bugfixes.

- Return after an error in RPC.
- Use an empty vim table for serialization.

runtime/lua/vim/lsp.lua

@@ -400,7 +400,7 @@ function lsp.start_client(config)
     rpc.request('initialize', initialize_params, function(init_err, result)
       assert(not init_err, tostring(init_err))
       assert(result, "server sent empty result")
-      rpc.notify('initialized', {})
+      rpc.notify('initialized', {[vim.type_idx]=vim.types.dictionary})
       client.initialized = true
       uninitialized_clients[client_id] = nil
       client.server_capabilities = assert(result.capabilities, "initialize result doesn't contain capabilities")