Starrers view: fix search icon, change placeholder, fix "no starrers" when search does not match

app/views/projects/starrers/index.html.haml

@@ -10,7 +10,7 @@
       = form_tag request.original_url, method: :get, class: 'form-inline user-search-form flex-users-form' do
         .form-group
           .position-relative
-            = search_field_tag :search, params[:search], { placeholder: _('Find starrers by name'), class: 'form-control', spellcheck: false }
+            = search_field_tag :search, params[:search], { placeholder: _('Search'), class: 'form-control', spellcheck: false }
             %button.user-search-btn{ type: "submit", "aria-label" => _("Submit search") }
               = icon("search")
           .dropdown.inline.user-sort-dropdown
@@ -27,4 +27,7 @@
     = render partial: 'starrer', collection: @starrers, as: :starrer
   = paginate @starrers, theme: 'gitlab'
 - else
+  - if params[:search].present?
+    .nothing-here-block No starrers matched your search
+  - else
     .nothing-here-block Nobody has starred this repository yet