Check if the table exists or not in shiny application

I have something in mind. I am planning to check if the table exists in the webpage. For example, in the below application, there is table displayed on the webpage. So I need to print somewhere on the webpage that the table exists. Something like, if it exists, then 1 or else 0.

Can we populate this?


ui <- fluidPage(

server <- function(input, output, session) {
 output$tab <- renderDT({

shinyApp(ui, server)

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