Handled null pointer exception.
Fixed window scroll issue.
Added ... for class page title.
Fixed array index out of bound exception.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Fixed issue with displaying math symbols in multiple answers.
  "Handled publish status value when change visiblity from public to private/sharable"
  Fixed issue with displaying math symbols as options in the player.
Merge pull request #597 from anilgooru/dev-branch

Bug fixes.