fix(buttons): fix onClick bug (#1118)

Author: montezume

src/components/buttons/accessible-button/accessible-button.js

@@ -8,7 +8,7 @@ const AccessibleButton = React.forwardRef((props, ref) => {
 
   const handleClick = React.useCallback(
     event => {
-      if (!props.isDisabled) return onClick(event);
+      if (!props.isDisabled && onClick) return onClick(event);
       // eslint-disable-next-line no-useless-return, consistent-return
       return;
     },

src/components/buttons/secondary-button/secondary-button.spec.js

@@ -73,7 +73,7 @@ describe('rendering', () => {
   describe('when using "linkTo"', () => {
     it('should navigate to link when clicked', async () => {
       const { getByLabelText, history } = render(
-        <SecondaryButton {...props} linkTo="/foo/bar" />
+        <SecondaryButton {...props} onClick={null} linkTo="/foo/bar" />
       );
       fireEvent.click(getByLabelText('Add'));
       await wait(() => {