Fix notices when breadcrumbs disabled

Using context_admin could lead to notices like

Notice: Undefined index: display в функции panels_breadcrumbs_ctools_render_alter() (строка 116 в файле /home/u4352/domains/22.u4352.citrine.vps-private.net/sites/all/modules/panels_breadcrumbs/panels_breadcrumbs.module).
Notice: Trying to get property of non-object в функции panels_breadcrumbs_ctools_render_alter() (строка 116 в файле /home/u4352/domains/22.u4352.citrine.vps-private.net/sites/all/modules/panels_breadcrumbs/panels_breadcrumbs.module).

thats all because there's no display context, suppose the same when page manager used without panels