[gnome-builder] device-manager: add check for NULL devices list

[Christian Hergert <chergert src gnome org>]

commit d03026904ce1256bbbf0cfe3f0240e4234f343ae
Author: Christian Hergert <chergert redhat com>
Date:   Sun Feb 14 20:37:36 2016 -0800

    device-manager: add check for NULL devices list

 libide/ide-device-manager.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libide/ide-device-manager.c b/libide/ide-device-manager.c
index 58a952b..8df4f56 100644
--- a/libide/ide-device-manager.c
+++ b/libide/ide-device-manager.c
@@ -128,6 +128,9 @@ ide_device_manager__provider_device_removed (IdeDeviceManager  *self,
   g_return_if_fail (IDE_IS_DEVICE (device));
   g_return_if_fail (IDE_IS_DEVICE_PROVIDER (provider));
 
+  if (self->devices == NULL)
+    return;
+
   for (i = 0; i < self->devices->len; i++)
     {
       IdeDevice *current = g_ptr_array_index (self->devices, i);