add guarding code to avoid NullPointerException in #139
new feature time synchronization
Merge pull request #173 from giteshnandre/cosbench-advanced-ui-issue-fixes

Cosbench advanced ui issue fixes
fix issue #139
add tolerable value for time synchronization
fixed issue: after generating workload config files from advanced config UI, workload name attribute value inside workload config file was not getting changed as per the value entered by user