Auto merge of #1097 - djvoa12:learnergroup-fix, r=jrjohnson
Auto merge of #1097 - djvoa12:learnergroup-fix, r=jrjohnson

fixed issue #1082

Fixes #1082
- Fixes `Available Learner Groups` not populating for offerings with no groups
- Fixes duplicate issue on the `Selected Learner Groups` side

gabycampagna/frontend,stopfstedt/frontend,thecoolestguy/frontend,djvoa12/frontend,jrjohnson/frontend,jrjohnson/frontend,gboushey/frontend,stopfstedt/frontend,dartajax/frontend,dartajax/frontend,ilios/frontend,gboushey/frontend,thecoolestguy/frontend,djvoa12/frontend,gabycampagna/frontend,ilios/frontend