Handle zero-length UDP datagrams
Handle zero-length UDP datagrams

libuv may signal us with zero-length datagrams on MoarVM using certain
OSes, so we need to handle this

skids/roast,perl6/roast,b2gills/roast,skids/roast,zostay/roast,zostay/roast,dogbert17/roast,dankogai/roast,zostay/roast,b2gills/roast,dankogai/roast,skids/roast,b2gills/roast,dogbert17/roast,bitrauser/roast,bitrauser/roast,dankogai/roast