Fix crash when detecting binary cache

[JackBoosY]

vcpkg-tool/src/vcpkg/binarycaching.cpp

Lines 1451 to 1455 in abe9562

	auto cache_status = build_cache_status_vector(actions, m_status);
	for (auto&& provider : m_providers)
	{
	provider->precheck(paths, actions, cache_status);
	}

vcpkg-tool/src/vcpkg/binarycaching.cpp

Lines 1416 to 1429 in abe9562

	static std::vector<CacheStatus*> build_cache_status_vector(View<Dependencies::InstallPlanAction> actions,
	std::unordered_map<std::string, CacheStatus>& status)
	{
	std::vector<CacheStatus*> results{actions.size()};
	for (size_t idx = 0; idx < actions.size(); ++idx)
	{
	const auto abi = actions[idx].package_abi().get();
	if (abi)
	{
	results[idx] = &status[*abi];
	}
	}
	return results;

m_status maybe empty so cache_status[idx] maybe a nullptr.

[JackBoosY]

Or

Suggested change

	results[idx] = cache_status[idx]->get_available_provider() ? CacheAvailability::available
	: CacheAvailability::unavailable;
	results[idx] = cache_status[idx]
	? (cache_status[idx]->get_available_provider() ? CacheAvailability::available
	: CacheAvailability::unavailable)
	: CacheAvailability::unavailable;