tag.c: Refactor parse_tag_buffer to be saner to program

diff --git a/revision.c b/revision.c
index 34f9ab98d1872770ef4d54014c31ece6eb7c8c39..c92ffc2a58bcda0744da44a31bce7d7112b1e510 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -536,6 +536,9 @@ static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
                        right_count++;
        }
 
+       if (!left_count || !right_count)
+               return;
+
        left_first = left_count < right_count;
        init_patch_ids(&ids);
        if (revs->diffopt.nr_paths) {