Error when using reset() on a sliderInput that was initialized was value = NULL

[daattali]

It's not clear whether NULL should or should not be a valid value for slider inputs (rstudio/shiny#2909) but currently shiny allows it, and reset doesn't deal with it nicely.

library(shiny)

ui <- fluidPage(
  shinyjs::useShinyjs(),
  sliderInput("test", "test", min = 5, max = 10, value = NULL), 
  actionButton("reset", "reset")
)

server <- function(input, output, session) {
  observeEvent(input$reset, {
    shinyjs::reset("test")
  })
}

shinyApp(ui, server)