Use defined instead of empty
Use defined instead of empty

Prevents exception in strict Twig.
electrolinux/bolt,joshuan/bolt,HonzaMikula/masivnipostele,GawainLynch/bolt,bolt/bolt,Intendit/bolt,nikgo/bolt,GawainLynch/bolt,joshuan/bolt,romulo1984/bolt,rarila/bolt,lenvanessen/bolt,Intendit/bolt,electrolinux/bolt,lenvanessen/bolt,HonzaMikula/masivnipostele,joshuan/bolt,HonzaMikula/masivnipostele,GawainLynch/bolt,electrolinux/bolt,romulo1984/bolt,joshuan/bolt,bolt/bolt,bolt/bolt,romulo1984/bolt,HonzaMikula/masivnipostele,nikgo/bolt,lenvanessen/bolt,rarila/bolt,electrolinux/bolt,rarila/bolt,romulo1984/bolt,nikgo/bolt,Intendit/bolt,GawainLynch/bolt,lenvanessen/bolt,Intendit/bolt,nikgo/bolt,rarila/bolt,bolt/bolt