old_contents: // breadcrumbs functionality will be rewritten, and this component is theme-specific
  export default {
    name: 'Breadcrumbs',
    props: {
      routes: {
        type: Array,
        required: true
      },
      activeRoute: {
        type: String,
        required: true
      }
    }
  }
  
new_contents: // breadcrumbs functionality will be rewritten, and this component is theme-specific
  export default {
    name: 'Breadcrumbs',
    props: {
      routes: {
        type: Array,
        required: true
      },
      activeRoute: {
        type: String,
        default: ''
      }
    }
  }
  
subject: fix breadcrumb required value