breadcrumb adds page title as "last" crumb when there are no crumbs

[jenlampton]

Description of the bug When I check the option Display the current page title as the last breadcrumb and have the breadcrumb block on them home page (when the home page is using the default layout, for example) the page title prints in the breadcrumb area, even though there are no breadcrumbs.

Steps To Reproduce To reproduce the behavior:

1. Switch home page to use default layout (or disable home page layout)
2. Configure breadcrumb block on default layout: check the option Display the current page title as the last breadcrumb
3. Visit the home page

Actual behavior The page title prints in the breadcrumb area, even though there are no breadcrumbs.

Expected behavior I would expect that when there are no crumbs, there is no page title.

[NormPlum]

This seemed fairly simple, so I made a PR: https://github.com/backdrop/backdrop/pull/4958

[avpaderno]

I left a comment in the PR.

[stpaultim]

Can we update the steps to reproduce, just to verify if the problem has changed since this ticket was written.

If I do the steps to reproduce exactly as written (I chose to disable home page layout), I get this:

Steps To Reproduce
To reproduce the behavior:

* Switch home page to use default layout (or disable home page layout)
* Configure breadcrumb block on default layout: check the option Display the current page title as the last breadcrumb
* Visit the home page

Otherwise, how does one switch home page to use default layout?

[NormPlum]

After disabling the homepage layout I set a new homepage via Site Information (so you get something other than a Page Not Found).

[stpaultim]

@NormPlum Thanks, that was helpful.

I've tested the PR and compared it to a site without the PR and I believe that this does fix the problem. I'll give it a WFM.