Fixes crash when including a folder that contains a non-empty file without any values followed by any other non-empty file.
@@ -300,7 +300,8 @@ config_process_include(const char *path, int recursion_level, int extended,
tor_free(config_file);
**next = included_list;
- *next = &(*list_last)->next;
+ if (*list_last)
+ *next = &(*list_last)->next;
} SMARTLIST_FOREACH_END(config_file);
smartlist_free(config_files);