for (auto i: cpl->reels()) {
auto reel_sub = i->main_subtitle();
BOOST_REQUIRE (reel_sub);
auto sub = reel_sub->asset();
BOOST_REQUIRE (sub);
for (auto i: cpl->reels()) {
auto reel_sub = i->main_subtitle();
BOOST_REQUIRE (reel_sub);
auto sub = reel_sub->asset();
BOOST_REQUIRE (sub);