Related-Bug: #1403538

Added null check while setting the default value in drop-down.
Earlier,it's failing when there are no values in drop-down

Change-Id: I72701df3c2f149949e345f20442c7c8552719995
Style changes and Enhancements
- Added sidebar cookies to save the state of sidebar
- Style changes to Sidebar on open and close
- CSS Cleanup
- Added a number formatter for packets to be separated by commas (eg. 10000 -> 10,000)
- Changed styles for for empty messages on visualization

Change-Id: Ifa012392e3cd47800c518a2bbb3aa42ad205a4c1