:lipstick: Use unless instead of if not
:lipstick: Use unless instead of if not

learn-co/learn-ide-tree,pombredanne/tree-view-1,tomekwi/tree-view,samu/tree-view,Galactix/tree-view,matthewbauer/tree-view,thgaskell/tree-view,tbryant/tree-view,ALEXGUOQ/tree-view,laituan245/tree-view,jarig/tree-view,benjaminRomano/tree-view,atom/tree-view,rajendrant/tree-view-remote,ayumi/tree-view,jasonhinkle/tree-view,cgrabowski/webgl-studio-tree-view