GUI: demonstrate that blender has recieved results of the request

pkg_ui.py

@@ -13,12 +13,21 @@ class USERPREF_PT_packages(bpy.types.Panel):
         return (userpref.active_section == 'PACKAGES')
 
     def draw(self, context):
+        wm = context.window_manager
+        # pm = wm.package_manager
+        # see comment in __init__.py
+        pm_settings = wm.package_manager_settings
+        # pm_last_code = wm.pm_last_response_code
         layout = self.layout
 
         row = layout.row()
-        row.prop(context.window_manager.package_manager_settings, "url")
+        row.prop(pm_settings, "url")
         row.operator(pkg_ops.PACKAGE_OT_fetch.bl_idname, text="Fetch")
 
+        row = layout.row()
+        # just a demonstration
+        row.label(text="Last response: %s" % pkg_ops.PACKAGE_OT_fetch.last_response)
+
 def register():
     bpy.utils.register_class(USERPREF_PT_packages)