Show `No user list selected` in feature flags

If a user hasn't yet selected a list, display a message explaining as
such.

app/assets/javascripts/feature_flags/components/strategies/gitlab_user_list.vue

@@ -27,7 +27,7 @@ export default {
     rolloutUserListLabel: s__('FeatureFlag|User List'),
     rolloutUserListDescription: s__('FeatureFlag|Select a user list'),
     rolloutUserListNoListError: s__('FeatureFlag|There are no configured user lists'),
-    defaultDropdownText: s__('FeatureFlags|Select a user list'),
+    defaultDropdownText: s__('FeatureFlags|No user list selected'),
   },
   computed: {
     ...mapGetters(['hasUserLists', 'isLoading', 'hasError', 'userListOptions']),
@@ -36,7 +36,7 @@ export default {
       return this.strategy?.userList?.id ?? '';
     },
     dropdownText() {
-      return this.strategy?.userList?.name ?? this.$options.defaultDropdownText;
+      return this.strategy?.userList?.name ?? this.$options.translations.defaultDropdownText;
     },
   },
   mounted() {

changelogs/unreleased/fix-empty-user-list-dropdown-text.yml

+---
+title: Show "No user list selected" in feature flags
+merge_request: 46790
+author:
+type: fixed

locale/gitlab.pot

@@ -11452,6 +11452,9 @@ msgstr ""
 msgid "FeatureFlags|New user list"
 msgstr ""
 
+msgid "FeatureFlags|No user list selected"
+msgstr ""
+
 msgid "FeatureFlags|Percent of users"
 msgstr ""
 
@@ -11476,9 +11479,6 @@ msgstr ""
 msgid "FeatureFlags|Rollout Strategy"
 msgstr ""
 
-msgid "FeatureFlags|Select a user list"
-msgstr ""
-
 msgid "FeatureFlags|Set the Unleash client application name to the name of the environment your application runs in. This value is used to match environment scopes. See the %{linkStart}example client configuration%{linkEnd}."
 msgstr ""
 

spec/frontend/feature_flags/components/strategies/gitlab_user_list_spec.js

@@ -25,6 +25,8 @@ describe('~/feature_flags/components/strategies/gitlab_user_list.vue', () => {
       propsData: { ...DEFAULT_PROPS, ...props },
     });
 
+  const findDropdown = () => wrapper.find(GlDropdown);
+
   describe('with user lists', () => {
     const findDropdownItem = () => wrapper.find(GlDropdownItem);
 
@@ -34,7 +36,7 @@ describe('~/feature_flags/components/strategies/gitlab_user_list.vue', () => {
     });
 
     it('should show the input for userListId with the correct value', () => {
-      const dropdownWrapper = wrapper.find(GlDropdown);
+      const dropdownWrapper = findDropdown();
       expect(dropdownWrapper.exists()).toBe(true);
       expect(dropdownWrapper.props('text')).toBe(userList.name);
     });
@@ -87,11 +89,15 @@ describe('~/feature_flags/components/strategies/gitlab_user_list.vue', () => {
   describe('without user lists', () => {
     beforeEach(() => {
       Api.searchFeatureFlagUserLists.mockResolvedValue({ data: [] });
-      wrapper = factory();
+      wrapper = factory({ strategy: { ...userListStrategy, userList: null } });
     });
 
     it('should display a message that there are no user lists', () => {
       expect(wrapper.text()).toContain('There are no configured user lists');
     });
+
+    it('should dispaly a message that no list has been selected', () => {
+      expect(findDropdown().text()).toContain('No user list selected');
+    });
   });
 });