empty map causes proto-repl to not pretty print value

[chriswatrous]

If I have a value like this:

{:cached nil,
 :request-time 129,
 :repeatable? false,
 :protocol-version {:name "HTTP", :major 1, :minor 1},
 :streaming? true,
 :http-client [org.apache.http.impl.client.InternalHttpClient
               1099947407
               "org.apache.http.impl.client.InternalHttpClient@418fdd8f"],
 :chunked? false,
 :reason-phrase "OK",
 :headers {"Access-Control-Allow-Origin" "*",
           "Via" "1.1 vegur",
           "Date" "Fri, 04 Jan 2019 01:24:34 GMT",
           "Access-Control-Allow-Credentials" "true",
           "Content-Length" "429",
           "Server" "gunicorn/19.9.0",
           "Content-Type" "application/json",
           "Connection" "close"},
 :orig-content-encoding nil,
 :status 200,
 :length 429,
 :body {:slideshow {:date "date of publication",
                    :slides [{:type "all",
                              :title "Wake up to WonderWidgets!"}
                             {:type "all",
                              :title "Overview",
                              :items ["Why <em>WonderWidgets</em> are great"
                                      "Who <em>buys</em> WonderWidgets"]}],
                    :title "Sample Slide Show",
                    :author "Yours Truly"}},
 :trace-redirects []}

it is nicely pretty printed. This was copied from the repl output.

If I put an empty map {} anywhere in the structure, as a key or value in a map, or as a vector item, it prints all on one line:

{:cached nil, :request-time 129, :repeatable? false, :protocol-version {:name "HTTP", :major 1, :minor 1}, :streaming? true, :http-client [org.apache.http.impl.client.InternalHttpClient 1099947407 "org.apache.http.impl.client.InternalHttpClient@418fdd8f"], :chunked? false, :reason-phrase "OK", :headers {"Access-Control-Allow-Origin" "*", "Via" "1.1 vegur", "Date" "Fri, 04 Jan 2019 01:24:34 GMT", "Access-Control-Allow-Credentials" "true", "Content-Length" "429", "Server" "gunicorn/19.9.0", "Content-Type" "application/json", "Connection" "close"}, :orig-content-encoding nil, :status 200, :length 429, :body {:slideshow {:date "date of publication", :slides [{:type "all", :a {}, :title "Wake up to WonderWidgets!"} {:type "all", :title "Overview", :items ["Why <em>WonderWidgets</em> are great" "Who <em>buys</em> WonderWidgets"]}], :title "Sample Slide Show", :author "Yours Truly"}}, :trace-redirects []}

I haven't seen this behavior with any other value but empty map.

bash> apm -v
apm  2.1.2
npm  6.2.0
node 8.9.3 x64
atom 1.33.1
python 2.7.14
git 2.16.2

macOS 10.14.2 proto-repl 1.4.24