If you add a menu item without a link you are permitted to save the changes

and when you try to view any page volto crashes:

Either the editing shouldn't allow the saving if there are missing entries in required fields or/and the view code should be
resilient enough in order not to crash the entire page

How to reproduce?

• create a second menu with a 'simple link' menu item with a target that is not published.
• log out
• go to front page
• reload page
• log in
• go to location with the non default menu

What happens?

• Error on flattenToAppUrl:
  NavLink lacks linkUrl

I propose to dispatch action 'getDropdownMenuNavitems' on login.

const Navigation = ({ pathname, token, type, children }) => {

  ...

  useEffect(() => {
    dispatch(getDropdownMenuNavitems());
  }, [dispatch, token]);

Basic CSS formatting to properly block display drop down list elements and negative white shape. At the moment, you have to customize these after the fact.

Current Behavior:

Suggested Formatting (Example)

From what I'm reading, It doesn't look like mrsdeveloper is the recommended approach to managing addons.
It seems I need to use package.json
It would be helpful to include instructions on how to do this directly within the README

With a simple volto app created and using only volto-dropdown menu as seen in the following package.json
https://gist.github.com/ichim-david/d42165da776faa6f1774bbc57e9243b4

When I try to add a block as soon as I click on the add icon I get a save action as seen in the screenshot

I then add a listing block and I hit the save icon trying to save

Then I add a new menu item

And when I go to check the previous menu item the block data is gone both from edit on missing in view

When dropdown menu is open, it gets open class as expected, but also active as it should be if it's the active path.
Those should be managed separately