The breadcrumb section is used for a single pane mode for showing the current user location. The breadcrumb should not be shown if its title and subtitle are empty. The code in PreferenceActivity onCreate updates the breadcrumb with the title and subtitle in a single page mode but does not hide it if they are empty. This change fixes that. bug:11242762 Change-Id: Ib1ba9e8afd9d0ab2e85d78a65ca7c18489464f6d