Merge branch 'fix/default-error-absencereasongroupselect' into 'master'

Fix warning about mutable default arguments

See merge request !37

aleksis/apps/kolego/frontend/components/AbsenceReasonButtons.vue

@@ -29,7 +29,7 @@ export default {
     customAbsenceReasons: {
       type: Array,
       required: false,
-      default: [],
+      default: () => [],
     },
   },
   computed: {

aleksis/apps/kolego/frontend/components/AbsenceReasonGroupSelect.vue

@@ -47,7 +47,7 @@ export default {
     customAbsenceReasons: {
       type: Array,
       required: false,
-      default: [],
+      default: () => [],
     },
   },
   computed: {