[libgit2-glib] Allow diff without repository

[Alberto Fanjul <albfan src gnome org>]

commit 8f8ae68a85011fceb944575488aa3a94458e8eea
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Wed Dec 22 23:46:40 2021 +0100

    Allow diff without repository

 libgit2-glib/ggit-diff.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/libgit2-glib/ggit-diff.c b/libgit2-glib/ggit-diff.c
index d6c0f1a..06e0657 100644
--- a/libgit2-glib/ggit-diff.c
+++ b/libgit2-glib/ggit-diff.c
@@ -208,12 +208,17 @@ ggit_diff_file_callback_wrapper (const git_diff_delta *delta,
 
                        path = ggit_diff_file_get_path (file);
 
-                       data->encoding =
-                               ggit_repository_get_attribute (priv->repository,
-                                                              path,
-                                                              "encoding",
-                                                              GGIT_ATTRIBUTE_CHECK_FILE_THEN_INDEX,
-                                                              NULL);
+                       if (priv->repository != NULL)
+                       {
+                               data->encoding =
+                                       ggit_repository_get_attribute (priv->repository,
+                                                                      path,
+                                                                      "encoding",
+                                                                      GGIT_ATTRIBUTE_CHECK_FILE_THEN_INDEX,
+                                                                      NULL);
+                       } else {
+                               data->encoding = "UTF-8";
+                       }
                }
        }