[fenix] Closes https://github.com/mozilla-mobile/fenix/issues/24276: fix history list displaying empty state until refresh

app/src/main/java/org/mozilla/fenix/library/history/HistoryView.kt

@@ -36,12 +36,17 @@ class HistoryView(
 
     val historyAdapter = HistoryAdapter(interactor).apply {
         addLoadStateListener {
-            adapterItemCount = itemCount
-            Log.d("hehehaha", "adapterItemCount = $adapterItemCount")
+            // first call will always have itemCount == 0, but we want to keep adapterItemCount
+            // as null until we can distinguish an empty list from populated, so updateEmptyState()
+            // could work correctly
+            if (itemCount != 0) {
+                adapterItemCount = itemCount
+            }
             if (it.source.refresh is LoadState.NotLoading &&
                 it.append.endOfPaginationReached &&
                 itemCount < 1
             ) {
+                adapterItemCount = 0
                 onZeroItemsLoaded.invoke()
             }
         }