doc generation: do not set required fields for mainPerson, person1, person2

src/Bundle/ChillPersonBundle/Service/DocGenerator/AccompanyingPeriodContext.php

@@ -165,6 +165,7 @@ class AccompanyingPeriodContext implements
                     },
                     'multiple' => false,
                     'expanded' => true,
+                    'required' => false,
                     'label' => $options[$key . 'Label'],
                 ]);
             }