customize the 'none' into something more user-frieldly

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

@@ -167,6 +167,7 @@ class AccompanyingPeriodContext implements
                     'expanded' => true,
                     'required' => false,
                     'label' => $options[$key . 'Label'],
+                    'placeholder' => $this->translator->trans('Any person selected'),
                 ]);
             }
         }