[PP-1] Empty breadcrumb at node/add and node/add/{content_type} when frontpage view is enabled

Over in [#3344200[ I'm proposing that we do not add empty titles to the breadcrumb as this is obviously wrong. That would fix the issue and make the breadcrumbs correct based on the current node.add path. I think the solution here might then be unnecessary. And then we can consider re-scoping this issue to be about moving the node.add path dependent on node_settings::use_admin_theme config setting.

@alexpott: 100%, let's at least postpone this issue on 🐛 PathBasedBreadcrumbBuilder needs to be able to exclude pointless paths Needs work and see what happens.

So if we do the current implementation on [#3344200 you get a breadcrumb of Home >> Node - it creates a title of Node based on the path.