Display Dashboard correctly after import #196
Display Dashboard correctly after import #196

* When importing a JSON file the Dashboard charts and legends were
  not showing correctly. The legend and percentages would sometimes
  be missing.
* Changed No Value Detected to be hidden after load
* Cached graph data after the first load so that a db lookup isnt
  needed for each redraw of the charts
* Fixed bug where the packages bar graph displayed incorrect colors

Signed-off-by: Jillian Daguil <8e927abf8e72a52d2816b020862fa1a32fbeb0d6@nexb.com>'

nexB/aboutcode-manager,nexB/aboutcode-manager,nexB/aboutcode-manager