[ostree] repo: Fix assertion to allow NULL options

[Colin Walters <walters src gnome org>]

commit 191d78ebfc2825d698da5f1eb0267a8570da84d6
Author: Colin Walters <walters verbum org>
Date:   Tue Mar 3 21:18:40 2015 -0500

    repo: Fix assertion to allow NULL options
    
    Spotted by Adam Coldrick.

 src/libostree/ostree-repo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index 5702825..558d008 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -671,7 +671,7 @@ impl_repo_remote_add (OstreeRepo     *self,
 
   g_return_val_if_fail (name != NULL, FALSE);
   g_return_val_if_fail (url != NULL, FALSE);
-  g_return_val_if_fail (g_variant_is_of_type (options, G_VARIANT_TYPE ("a{sv}")), FALSE);
+  g_return_val_if_fail (options == NULL || g_variant_is_of_type (options, G_VARIANT_TYPE ("a{sv}")), FALSE);
 
   if (strchr (name, '/') != NULL)
     {