Chat handle creation erroneous error

[0xdiba]

When trying to create a chat handle that is not present in the slack organisation the following error is returned:

cogctl chat-handles create --user user --handle user --chat-provider slack              
** (FunctionClauseError) no function clause matching in Access.fetch/2
   (elixir) lib/access.ex:147: Access.fetch("Server internal error", "errors")
   (elixir) lib/access.ex:179: Access.get/3
   (cogctl) lib/cogctl/actions/chat_handles/create.ex:22: Cogctl.Actions.ChatHandles.Create.do_create/2
   (cogctl) lib/cogctl.ex:20: Cogctl.main/1
   (elixir) lib/kernel/cli.ex:76: anonymous fn/3 in Kernel.CLI.exec_fun/2 

A more descriptive error should be returned.