Add default value to absence-reason-chip if none is provided

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

@@ -14,7 +14,17 @@ export default {
     };
   },
   apollo: {
-    absenceReasons: gqlAbsenceReasons,
+    absenceReasons: {
+      query: gqlAbsenceReasons,
+      result({ data }) {
+        if (!this.innerValue) {
+          const defaultReason = data.absenceReasons.find((ar) => ar.default);
+          if (defaultReason) {
+            this.updateInnerValue(defaultReason.id);
+          }
+        }
+      },
+    },
   },
   props: {
     allowEmpty: {
@@ -23,7 +33,8 @@ export default {
     },
     value: {
       type: [String, Number],
-      required: true,
+      required: false,
+      default: null,
     },
     emptyValue: {
       type: [String, Number],