Don't disable submit buttonw when there is text in the input

See https://gitlab.com/gitlab-org/gitlab-ce/issues/34336

app/assets/javascripts/issuable/related_issues/components/add_issuable_form.vue

@@ -47,7 +47,8 @@ export default {
 
   computed: {
     isSubmitButtonDisabled() {
-      return this.pendingReferences.length === 0 || this.isSubmitting;
+      return (this.inputValue.length === 0 && this.pendingReferences.length === 0)
+        || this.isSubmitting;
     },
   },
 

spec/javascripts/issuable/related_issues/components/add_issuable_form_spec.js

@@ -40,6 +40,7 @@ describe('AddIssuableForm', () => {
 
   describe('with data', () => {
     describe('without references', () => {
+      describe('without any input text', () => {
         beforeEach(() => {
           vm = new AddIssuableForm({
             propsData: {
@@ -56,6 +57,23 @@ describe('AddIssuableForm', () => {
         });
       });
 
+      describe('with input text', () => {
+        beforeEach(() => {
+          vm = new AddIssuableForm({
+            propsData: {
+              inputValue: 'foo',
+              addButtonLabel: 'Submit',
+              pendingReferences: [],
+            },
+          }).$mount();
+        });
+
+        it('should not have disabled submit button', () => {
+          expect(vm.$refs.addButton.disabled).toBe(false);
+        });
+      });
+    });
+
     describe('with references', () => {
       const inputValue = 'foo #123';
       const addButtonLabel = 'Add issuable';
@@ -84,6 +102,10 @@ describe('AddIssuableForm', () => {
       it('should render pending issuables items', () => {
         expect(vm.$el.querySelectorAll('.js-add-issuable-form-token-list-item').length).toEqual(2);
       });
+
+      it('should not have disabled submit button', () => {
+        expect(vm.$refs.addButton.disabled).toBe(false);
+      });
     });
 
     describe('when submitting', () => {