DX: fix phpstan errors

src/Bundle/ChillCalendarBundle/Controller/CalendarDocController.php

@@ -145,6 +145,9 @@ class CalendarDocController
                 $returnParams = ['id' => $calendarDoc->getCalendar()->getPerson()->getId()];
 
                 break;
+
+            default:
+                throw new \LogicException(sprintf("This context '%s' is not supported", $calendarDoc->getCalendar()->getContext()));
         }
 
         $form = $this->formFactory->createBuilder()