add empty screen message

app/src/main/java/com/keylesspalace/tusky/components/scheduled/ScheduledTootActivity.kt

@@ -64,7 +64,12 @@ class ScheduledTootActivity : BaseActivity(), ScheduledTootAction, Injectable {
                 Status.SUCCESS -> {
                     progressBar.hide()
                     swipeRefreshLayout.isRefreshing = false
-                    errorMessageView.hide()
+                    if(viewModel.data.value?.loadedCount == 0) {
+                        errorMessageView.setup(R.drawable.elephant_friend_empty, R.string.no_scheduled_status)
+                        errorMessageView.show()
+                    } else {
+                        errorMessageView.hide()
+                    }
                 }
                 Status.RUNNING -> {
                     errorMessageView.hide()

app/src/main/java/com/keylesspalace/tusky/view/BackgroundMessageView.kt

@@ -37,7 +37,7 @@ class BackgroundMessageView @JvmOverloads constructor(
      * If [clickListener] is `null` then the button will be hidden.
      */
     fun setup(@DrawableRes imageRes: Int, @StringRes messageRes: Int,
-              clickListener: ((v: View) -> Unit)?) {
+              clickListener: ((v: View) -> Unit)? = null) {
         messageTextView.setText(messageRes)
         messageTextView.setCompoundDrawablesWithIntrinsicBounds(0, imageRes, 0, 0)
         button.setOnClickListener(clickListener)