app list search Properly test for empty result container score

Follow-up on CL:2106509 which changed empty container score from -1 to
0. (that CL originally had this change, but it got lost somewhere when
I was moving it to a branch for upload).

Change-Id: I31d7697770c0a400e504bff0e051b337661d1221
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153943Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760117}

ash/app_list/views/search_result_page_view.cc

@@ -338,7 +338,7 @@ void SearchResultPageView::ReorderSearchResultContainers() {
     if (i > 0) {
       HorizontalSeparator* separator = separators_[i - 1];
       // Hides the separator above the container that has no results.
-      if (!view->container_score())
+      if (!view->num_results())
         separator->SetVisible(false);
       else
         separator->SetVisible(true);