Merge pull request #1815 from ssushma/dev-branch

Analytics null handling implemented
Missing file has been commited.
Merge pull request #1816 from shivalinga/dev-branch

Missing file has been commited.
1.1 QA [My Classes] Directions are displayed at minimum score and Due Date are not displayed at Unit details page when assignment assigned from library Share
Merge pull request #1818 from RavindderV/dev-branch

1.1 QA [My Classes] Directions are displayed at minimum score and Due Da...
Changes for edit button and delete class buttons