[gnome-multi-writer] trivial: Don't show the settings button if no device is connected

[Richard Hughes <rhughes src gnome org>]

commit b8f360cdc2ff0dc637d26e10f00f006938f49009
Author: Richard Hughes <richard hughsie com>
Date:   Fri Jan 9 20:37:56 2015 +0000

    trivial: Don't show the settings button if no device is connected

 src/gmw-main.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gmw-main.c b/src/gmw-main.c
index 25454b1..46922fa 100644
--- a/src/gmw-main.c
+++ b/src/gmw-main.c
@@ -226,6 +226,7 @@ gmw_refresh_ui (GmwPrivate *priv)
        /* allow changing settings */
        w = GTK_WIDGET (gtk_builder_get_object (priv->builder, "button_settings"));
        gtk_widget_set_sensitive (w, g_thread_pool_get_num_threads (priv->thread_pool) == 0);
+       gtk_widget_set_visible (w, priv->devices->len > 0);
 
        /* update buttons */
        w = GTK_WIDGET (gtk_builder_get_object (priv->builder, "button_cancel"));