Merge "LegacyStorage: Fix logic to be more robust" am: 7be4cc54

struct LegacyModule::impl {

  void config_read(const std::string filename, LegacyReadConfigCallback callback, os::Handler* handler) {

    handler->Post(common::BindOnce(std::move(callback), filename, legacy::osi::config::config_new(filename.c_str())));

    std::unique_ptr<config_t> config = legacy::osi::config::config_new(filename.c_str());

    if (config && !legacy::osi::config::config_has_section(*config, "Adapter")) {

      LOG_ERROR("Config is missing adapter section");

      config = nullptr;

    }

    if (!config) {

      config = legacy::osi::config::config_new_empty();

    }

    handler->Post(common::BindOnce(std::move(callback), filename, std::move(config)));

  }

  void config_write(const std::string filename, const config_t config, LegacyWriteConfigCallback callback,