[libdazzle] shortcuts: allow NULL manager to unset

[Christian Hergert <chergert src gnome org>]

commit 68ddbbf9a54947194893d7aa178cc56a3d1fc1d0
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 12 19:03:18 2017 -0700

    shortcuts: allow NULL manager to unset

 src/shortcuts/dzl-shortcut-theme.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/shortcuts/dzl-shortcut-theme.c b/src/shortcuts/dzl-shortcut-theme.c
index 2b874a4..d182b6c 100644
--- a/src/shortcuts/dzl-shortcut-theme.c
+++ b/src/shortcuts/dzl-shortcut-theme.c
@@ -621,7 +621,7 @@ _dzl_shortcut_theme_set_manager (DzlShortcutTheme   *self,
 
   g_return_if_fail (DZL_IS_SHORTCUT_THEME (self));
   g_return_if_fail (!manager || DZL_IS_SHORTCUT_MANAGER (manager));
-  g_return_if_fail (priv->manager == NULL);
+  g_return_if_fail (priv->manager == NULL || manager == NULL);
 
   priv->manager = manager;
 }