secondary_info: not displayed ALWAYS if "hide_unavailable: true"

[ildar170975]

If last-changed or last-updated are selected for secondary_info, it is not displayed if hide_unavailable: true set. The code:

  - type: entities
    entities:
      - type: custom:multiple-entity-row
        entity: sun.sun
        name: "hide_unavailable: false"
        entities: &ref_entities
          - entity: sun.sun
          - entity: sun.sun
        show_state: false
        secondary_info:
          attribute: last-changed
      - type: custom:multiple-entity-row
        entity: sun.sun
        name: "hide_unavailable: true"
        entities: *ref_entities
        show_state: false
        secondary_info:
          attribute: last-changed
          hide_unavailable: true