repo: Don't crash when creating a summary if we have --empty deltas

diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index b141049e6ad9731aa728fe8d07fd70d082780b83..6a20336a8208e6991e293f5234ec8676aac63484 100644 (file)
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -4030,8 +4030,7 @@ ostree_repo_regenerate_summary (OstreeRepo     *self,
         g_autoptr(GInputStream) in_stream = NULL;
 
         _ostree_parse_delta_name (delta_names->pdata[i], &from, &to);
-        superblock = _ostree_get_relative_static_delta_superblock_path (from[0] ? from : NULL,
-                                                                        to);
+        superblock = _ostree_get_relative_static_delta_superblock_path ((from && from[0]) ? from : NULL, to);
         superblock_file_fd = openat (self->repo_dir_fd, superblock, O_RDONLY | O_CLOEXEC);
         if (superblock_file_fd == -1)
           {