[gnome-builder] workbench: disable the action if there is no workspace mapping.

[Christian Hergert <chergert src gnome org>]

commit c0c6264edd139335177a0ba4858101e6bebdf952
Author: Christian Hergert <christian hergert me>
Date:   Tue Sep 9 23:09:13 2014 -0700

    workbench: disable the action if there is no workspace mapping.

 src/workbench/gb-workbench-actions.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/workbench/gb-workbench-actions.c b/src/workbench/gb-workbench-actions.c
index e221dc0..5c93aa7 100644
--- a/src/workbench/gb-workbench-actions.c
+++ b/src/workbench/gb-workbench-actions.c
@@ -97,6 +97,8 @@ connect_bindings (GbWorkbenchActions *actions,
                                            action, "enabled",
                                            G_BINDING_SYNC_CREATE);
          priv->bindings = g_slist_prepend (priv->bindings, binding);
+      } else {
+          g_simple_action_set_enabled (G_SIMPLE_ACTION (action), FALSE);
       }
    }
 }