Display empty text placeholder

ee/app/assets/javascripts/threat_monitoring/components/policies/scan_new_policy_modal.vue

@@ -30,6 +30,7 @@ export default {
     description: s__(
       'SecurityOrchestration|Select a project to store your security policies in. %{linkStart}More information.%{linkEnd}',
     ),
+    emptyPlaceholder: s__('SecurityOrchestration|Choose a project'),
   },
   components: {
     GlButton,
@@ -216,7 +217,7 @@ export default {
           class="gl-w-full"
           menu-class="gl-w-full! gl-max-w-full!"
           :disabled="disableSecurityPolicyProject"
-          :text="selectedProjectName"
+          :text="selectedProjectName || $options.i18n.emptyPlaceholder"
         >
           <instance-project-selector
             class="gl-w-full"

ee/spec/frontend/threat_monitoring/components/policies/scan_new_policy_modal_spec.js

@@ -99,6 +99,10 @@ describe('ScanNewPolicyModal Component', () => {
       });
     });
 
+    it('displays a placeholder when no project is selected', () => {
+      expect(findDropdown().props('text')).toBe('Choose a project');
+    });
+
     it('does not display a warning', () => {
       expect(findAlert().exists()).toBe(false);
     });

locale/gitlab.pot

@@ -30875,6 +30875,9 @@ msgstr ""
 msgid "SecurityOrchestration|An error occurred unassigning your security policy project"
 msgstr ""
 
+msgid "SecurityOrchestration|Choose a project"
+msgstr ""
+
 msgid "SecurityOrchestration|Description"
 msgstr ""