title: ng test --code-coverage not printing coverage details
body: <blockquote>
    <p>When I run the tests using <code>ng test --code-coverage</code> I get the code coverage as unknown, not sure what might be going wrong. Any help here is appreciated.</p>
  </blockquote>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&gt; ng test --code-coverage
  
   10% building modules 1/1 modules 0 active26 06 2018 11:00:51.088:WARN [karma]: No captured browser, open http://localhost:9876/
  26 06 2018 11:00:51.095:INFO [karma]: Karma v2.0.0 server started at http://0.0.0.0:9876/
  26 06 2018 11:00:51.095:INFO [launcher]: Launching browser Chrome with unlimited concurrency
  26 06 2018 11:00:51.100:INFO [launcher]: Starting browser Chrome
  26 06 2018 11:01:48.404:WARN [karma]: No captured browser, open http://localhost:9876/    
  26 06 2018 11:01:48.665:INFO [Chrome 67.0.3396 (Mac OS X 10.11.6)]: Connected on socket UhrUQZiU8ZuG8qRwAAAA with id 31579746
  Chrome 67.0.3396 (Mac OS X 10.11.6): Executed 1151 of 2149 (skipped 843) SUCCESS (0 secs / 0 secs)
  26 06 2018 11:07:31.910:WARN [Chrome 67.0.3396 (Mac OS X 10.11.6)]: Disconnected (1 times), because no message in 10000 ms.
  Chrome 67.0.3396 (Mac OS X 10.11.6) ERROR
  Chrome 67.0.3396 (Mac OS X 10.11.6) ERROR
    Disconnected, because no message in 10000 ms.
  Chrome 67.0.3396 (Mac OS X 10.11.6): Executed 1151 of 2149 (skipped 843) DISCONNECTED (5 mins 31.686 secs / 0 secs)
  Chrome 67.0.3396 (Mac OS X 10.11.6) ERROR
  Chrome 67.0.3396 (Mac OS X 10.11.6): Executed 1151 of 2149 (skipped 843) DISCONNECTED (5 mins 31.686 secs / 0 secs)
  
  =============================== Coverage summary ===============================
  Statements   : Unknown% ( 0/0 )
  Branches     : Unknown% ( 0/0 )
  Functions    : Unknown% ( 0/0 )
  Lines        : Unknown% ( 0/0 )
  Chrome 67.0.3396 (Mac OS X 10.11.6): Executed 1295 of 2149 (skipped 854) DISCONNECTED (6 mins 49.413 secs / 0 secs)</code></pre>
  </div>
  </div>
  </p>