Refrain from setting email opt-in preference when checkbox is missing
Merge pull request #6137 from edx/renzo/missing-checkbox-absent-preference

Refrain from setting email opt-in preference when checkbox is missing
Fixed plus sign icon for overall grade range add button.
TNL-890
Merge pull request #6143 from edx/waheed/tnl890-fix-plus-sign-overall-grade-range

Fixed plus sign icon for overall grade range add button.