fixes error message when node with nil input is being moved
fixes error message when node with nil input is being moved

sebllll/vvvv.js,sebllll/vvvv.js,AndBicScadMedia/vvvv.js,sebllll/vvvv.js,zauner/vvvv.js,zauner/vvvv.js,AndBicScadMedia/vvvv.js,sebllll/vvvv.js,AndBicScadMedia/vvvv.js,AndBicScadMedia/vvvv.js,zauner/vvvv.js,sebllll/vvvv.js,zauner/vvvv.js,AndBicScadMedia/vvvv.js,zauner/vvvv.js