Bug fixes:

- Report proper errors when trying to change permissions
  - Turn off the auto-caps of the team names
  - Fix the is_org_member checks everywhere
  - Fix resetting of roles if the change was not successful

endpoints/api.py

@@ -1012,6 +1012,13 @@ def change_user_permissions(namespace, repository, username):
     except model.InvalidOrganizationException:
       # This repository is not part of an organization
       pass
+    except model.DataModelException as ex:
+      error_resp = jsonify({
+          'message': ex.message,
+          })
+      error_resp.status_code = 400
+      return error_resp
+      
 
     resp = jsonify(perm_view)
     if request.method == 'POST':
@@ -1051,7 +1058,15 @@ def change_team_permissions(namespace, repository, teamname):
 def delete_user_permissions(namespace, repository, username):
   permission = AdministerRepositoryPermission(namespace, repository)
   if permission.can():
-    model.delete_user_permission(username, namespace, repository)
+    try:
+      model.delete_user_permission(username, namespace, repository)
+    except model.DataModelException as ex:
+      error_resp = jsonify({
+          'message': ex.message,
+          })
+      error_resp.status_code = 400
+      return error_resp
+    
     return make_response('Deleted', 204)
 
   abort(403)  # Permission denied