def selected_criticality_tag(asset_id)
      selected_criticality = AJAX.get(self, "/data/asset/#{asset_id}/selected-criticality-tag")
      selected_criticality.empty? ? nil : JSON.parse(selected_criticality)['name']
    end
def selected_criticality_tag(asset_id)
      selected_criticality = AJAX.get(self, "/data/asset/#{asset_id}/selected-criticality-tag")
      selected_criticality.empty? ? nil : JSON.parse(selected_criticality)['name']
    end
Returns the criticality value which takes precedent for an asset

 @param [Fixnum] asset_id id of asset on which criticality tag is selected
 @return [String] selected_criticality string of the relevant criticality; nil if not tagged