Various log entries

The panel plugin generates various log entries:

25865 ? Sl 0:00 /usr/lib/xfce4/panel/wrapper-2.0 /usr/lib/xfce4/panel/plugins/libnotification-plugin.so

(wrapper-2.0:25865): GLib-GIO-CRITICAL **: 12:56:43.194: g_file_new_for_path: assertion 'path != NULL' failed

(wrapper-2.0:25865): GLib-GIO-CRITICAL **: 12:56:43.194: g_file_monitor_file: assertion 'G_IS_FILE (file)' failed

(wrapper-2.0:25865): GLib-GObject-WARNING **: 12:56:43.194: invalid (NULL) pointer instance

(wrapper-2.0:25865): GLib-GObject-CRITICAL **: 12:56:43.194: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

(wrapper-2.0:25865): Gtk-WARNING **: 12:56:43.194: Attempting to add a widget with type GtkToggleButton to a container of type XfcePanelPlugin, but the widget is already inside a container of type XfcePanelPlugin, please remove the widget from its existing container first.

(wrapper-2.0:25865): Gtk-WARNING **: 12:56:43.280: Negative content width -3 (allocation 1, extents 2x2) while allocating gadget (node button, owner GtkToggleButton)

Version: 0.6.2