[gnome-shell] Removing all favorites makes it impossible to add new ones

[Owen Taylor <otaylor src gnome org>]

commit 3ebb0f149d542c823e3f26fdd9cc294ab663028e
Author: Maxim Ermilov <zaspire rambler ru>
Date:   Tue Oct 27 14:54:23 2009 +0300

    Removing all favorites makes it impossible to add new ones
    
    Show the placeholder when all favorites are gone.
    https://bugzilla.gnome.org/show_bug.cgi?id=591854

 js/ui/appDisplay.js |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 1ded1bc..db2b507 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -860,6 +860,13 @@ AppWell.prototype = {
             let display = new RunningWellItem(app, false);
             this._grid.actor.add_actor(display.actor);
         }
+
+        if (this._grid.actor.get_n_children() == 1) {
+            let text = new Clutter.Text({ color: GenericDisplay.ITEM_DISPLAY_NAME_COLOR,
+                                          font_name: "Sans 14px",
+                                          text: _("Drag here to add favorites")});
+            this._grid.actor.add_actor(text);
+        }
     },
 
     // Draggable target interface