ISSUE #952 check UnityUtil.viewer exist before checking if function exists. (#953)
ISSUE #952 check UnityUtil.viewer exist before checking if function exists. (#953)


3drepo/3drepo.io,3drepo/3drepo.io,3drepo/3drepo.io,3drepo/3drepo.io,3drepo/3drepo.io,3drepo/3drepo.io