add example of LAS file with no points in it
add example of LAS file with no points in it

jwomeara/PDAL,DougFirErickson/PDAL,boundlessgeo/PDAL,Sciumo/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,mpgerlek/PDAL-old,verma/PDAL,Sciumo/PDAL,verma/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,verma/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,jwomeara/PDAL,Sciumo/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,verma/PDAL,mtCarto/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,lucadelu/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,DougFirErickson/PDAL,verma/PDAL,mtCarto/PDAL,DougFirErickson/PDAL,verma/PDAL,verma/PDAL,radiantbluetechnologies/PDAL