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a37d568082
When adding `workspace/didChangeWorkspaceFolders` support to my [language server](https://github.com/elixir-tools/next-ls), I noticed that when neovim removes a workspace, it sends an empty table (which is serialized to an empty JSON array) for the value in the `added` field. This does not follow the spec; the `added` table should just be empty. The following error led me to this discovery. Note the payload includes `"added" => [[]]`: ``` 22:46:48.476 [error] LSP Exited. Last message received: handle_notification %{"jsonrpc" => "2.0", "method" => "workspace/didChangeWorkspaceFolders", "params" => %{"event" => %{"added" => [[]], "removed" => [%{"name" => "/Users/mitchell/src/gen_lsp", "uri" => "file:///Users/mitchell/src/gen_lsp"}]}}} ** (MatchError) no match of right hand side value: {:error, %{"params" => %{"event" => %{"added" => [error: "expected a map"]}}}} (gen_lsp 0.4.0) lib/gen_lsp.ex:265: anonymous fn/4 in GenLSP.loop/3 (gen_lsp 0.4.0) lib/gen_lsp.ex:292: GenLSP.attempt/3 (stdlib 5.0.2) proc_lib.erl:241: :proc_lib.init_p_do_apply/3 ```
