Add `no-toolbar` state for "nothing here" batch table views (#32128)

app/javascript/styles/mastodon/tables.scss

@@ -359,6 +359,10 @@ a.table-action-link {
     @media screen and (max-width: $no-gap-breakpoint) {
       border-top: 1px solid var(--background-border-color);
     }
+
+    &--no-toolbar {
+      border-top: 1px solid var(--background-border-color);
+    }
   }
 
   @media screen and (width <= 870px) {

app/views/admin/tags/index.html.haml

@@ -32,7 +32,7 @@
 .batch-table
   .batch-table__body
     - if @tags.empty?
-      = nothing_here 'nothing-here--under-tabs'
+      = nothing_here 'nothing-here--under-tabs nothing-here--no-toolbar'
     - else
       = render partial: 'tag', collection: @tags