Fixed makeButton in utils.js so it doesn't generate invalid markup when some arguments are undefined.
Fixed makeButton in utils.js so it doesn't generate invalid
markup when some arguments are undefined.

vizorvr/patches,beni55/engi,vizorvr/vizor-create,engijs/engi,engijs/engi,beni55/engi,vizorvr/vizor-create,vizorvr/patches,vizorvr/patches,vizorvr/patches,engijs/engi,vizorvr/vizor-create,vizorvr/patches,beni55/engi,vizorvr/vizor,vizorvr/vizor,vizorvr/vizor