R Shiny: test existence of reactive value which is optional after req()

I have code like this

myfx <- reactive({
    isTruthy(data1()) || isTruthy(data2())
  if(exists(data2())) {
    # do some stuff
  ## do this other stuff regardless 

the if(exists()) piece is where I am stuck. exists is not the right function here, nor does validate(need(data2())) work. How can i conditionally execute some code if one of the optional reactives (from a group where at least one is required) exists?

Read more here: https://stackoverflow.com/questions/68473529/r-shiny-test-existence-of-reactive-value-which-is-optional-after-req

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