added control (if elements in axonlist have a gRatio or axon diameter of 0, remove them)
added control (if elements in axonlist have a gRatio or axon diameter of 0, remove them)

neuropoly/axon_segmentation,neuropoly/axon_segmentation,neuropoly/axonseg,neuropoly/axonseg,neuropoly/axonseg,neuropoly/axon_segmentation