feat(sharedUnivFeedback): back & front | Tweaks

Shared Univ Feedback:
* back done
* Front done
* auto created on univ creation

Tweaks:
* added check_obj_permissions_for_edit to essential serializer to be able to deeper check permissions for user_can_edit
* Fixed ExchangePermission to handle null student
* Visual simplification of previous exchanges with no data
9 jobs for master in 3 minutes and 54 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Check
passed #592695
docker
check_back

00:00:18

passed #592696
docker
check_front

00:01:13

 
  Test
passed #592697
docker
test_back

00:01:02

82.0%
passed #592698
docker
test_frontend

00:00:17

 
  Lint
passed #592700
docker
eslint

00:00:24

passed #592699
docker
flake8

00:00:13

 
  Svg Gen Docu
passed #592701
docker
generate_UML_svg

00:00:13

 
  Documentation
passed #592702
docker
pages

00:00:12

 
  Deploy
passed pages:deploy

00:00:00