[S06-macros/macros-d1.t] added Null PMC access test
[S06-macros/macros-d1.t] added Null PMC access test

discovered by samlh++

dankogai/roast,laben/roast,zostay/roast,dankogai/roast,cygx/roast,laben/roast,niner/roast,cygx/roast,skids/roast,skids/roast,perl6/roast,laben/roast,dankogai/roast,bitrauser/roast,skids/roast,dogbert17/roast,b2gills/roast,niner/roast,zostay/roast,b2gills/roast,bitrauser/roast,niner/roast,dogbert17/roast,zostay/roast,b2gills/roast,cygx/roast