anchor.diff:  %% "Cannot load data bag item not_really_there for data bag sack"
   
   
  -error_message_envelope(Message) when is_binary(Message) ->
  +error_message_envelope(Message) when is_binary(Message) orelse
  +                                     is_tuple(Message) ->
  +    %% Tuple guard added to accommodate depsolver messages.  This is part of an ongoing
  +    %% refactor, and may not ultimately be necessary.
       {[{<<"error">>, [Message]}]}.
   
   %% @doc Converts the given Ejson-encoded data to a JSON string and
  
positive.code:          object_name/2,
           set_json_body/2,
           set_uri_of_created_resource/1,
           set_uri_of_created_resource/2]).
  
  -include("chef_wm.hrl").
  
  
negative.code: set_json_body(Req, EjsonData) ->
      Json = ejson:encode(EjsonData),
      wrq:set_resp_body(Json, Req).
  
  %% @doc Convenience method for manipulating error data.  Data that is passed in is wrapped
  %% in an error message envelope, which is then encoded to JSON and set as the body of the
  %% request.  This updated request is returned.
  -spec with_error_body(Req :: wm_req(),
                        ErrorData :: ej:json_object() | ej:json_string()) ->
                               ReqWithErrorJSON :: wm_req().
  with_error_body(Req, ErrorData) ->
      ErrorPayload = error_message_envelope(ErrorData),
      set_json_body(Req, ErrorPayload).
  
  %% @doc Append a JSON map item to the request body and
  %% set it as the new request body, returning the updated request.
  