[gnome-builder] context: fix unloading context with zero buffers loaded

[Christian Hergert <chergert src gnome org>]

commit 3b45de4a6861c0c45559efb9d2ef076403c70a1a
Author: Christian Hergert <christian hergert me>
Date:   Mon Mar 30 13:55:13 2015 -0700

    context: fix unloading context with zero buffers loaded

 libide/ide-context.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/libide/ide-context.c b/libide/ide-context.c
index 31867e5..e3e13d9 100644
--- a/libide/ide-context.c
+++ b/libide/ide-context.c
@@ -1307,6 +1307,13 @@ ide_context_unload_buffer_manager (gpointer             source_object,
   buffers = ide_buffer_manager_get_buffers (self->buffer_manager);
 
   task = g_task_new (self, cancellable, callback, user_data);
+
+  if (buffers->len == 0)
+    {
+      g_task_return_boolean (task, TRUE);
+      return;
+    }
+
   g_object_set_data (G_OBJECT (task), "IN_PROGRESS", GINT_TO_POINTER (buffers->len));
 
   for (i = 0; i < buffers->len; i++)