[imp] Multilanguage: Breadcrumbs does not display submenus if the default Home menu item set to All languages is deleted

Test:
Install a basic multilingual site from scratch.
 See: https://github.com/joomla/joomla-cms/issues/4988
Create a submenu in the mainmenu of one of the languages.

Using PhpMyadmin, delete in the _menu table the row mainmenu with Home set to Language All, i.e. *

Display the site and the submenu
The breadcrumbs will not show the right items
you will also get an error:
`PHP Notice:  Trying to get property of non-object in ROOT/modules/mod_breadcrumbs/helper.php on line 51`

Patch and test again. 

(Don't forget to kill that test site as it is not normal to delete the mainmenu home menu item set to All languages in a multilingual site