Merge branch 'tr/maint-cherry-pick-list' into maint-1.6.6

* tr/maint-cherry-pick-list:
  cherry_pick_list: quit early if one side is empty

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) {