[ci skip] Fallback to empty object if no user is signed in

app/assets/javascripts/notes/components/issue_note_form.vue

@@ -154,4 +154,3 @@
     </form>
   </div>
 </template>
-

app/assets/javascripts/notes/stores/getters.js

@@ -9,7 +9,7 @@ export const getNotesDataByProp = state => prop => state.notesData[prop];
 export const getIssueData = state => state.issueData;
 export const getIssueDataByProp = state => prop => state.issueData[prop];
 
-export const getUserData = state => state.userData;
+export const getUserData = state => state.userData || {};
 export const getUserDataByProp = state => prop => state.userData && state.userData[prop];
 
 export const notesById = state => state.notes.reduce((acc, note) => {