Correction d'une notice qui aparaissait si on n'tait pas connecté: pas de selectable role

src/UnicaenAuth/Service/UserContext.php

@@ -335,12 +335,15 @@ class UserContext extends AbstractService implements EventManagerAwareInterface
             unset($this->getSessionContainer()->selectedIdentityRole);
         }
 
-        $role = $this->getSelectableIdentityRoles()[$role];
-        if ($role instanceof AbstractRole) {
-            $this->saveUserLastRole($role);
-        }
+        $selectableIdentityRoles = $this->getSelectableIdentityRoles();
+        if (isset($selectableIdentityRoles[$role])){
+            $role = $selectableIdentityRoles[$role];
+            if ($role instanceof AbstractRole) {
+                $this->saveUserLastRole($role);
+            }
 
-        $this->triggerUserRoleSelectedEvent(UserRoleSelectedEvent::POST_SELECTION, $role);
+            $this->triggerUserRoleSelectedEvent(UserRoleSelectedEvent::POST_SELECTION, $role);
+        }
 
         return $this;
     }