avoid error when schema.default is null
avoid error when schema.default is null

weddingdj/aframe,aframevr/aframe,wizgrav/aframe,aframevr/aframe,wizgrav/aframe,RSpace/aframe,dmarcos/aframe,ngokevin/aframe,mkungla/aframe,weddingdj/aframe,dmarcos/aframe,googlecreativelab/aframe,ngokevin/aframe,mkungla/aframe,RSpace/aframe,chenzlabs/aframe,googlecreativelab/aframe,chenzlabs/aframe