Modify  agdelete to indicate an error if the object does not belong to the graph
Modify  agdelete to indicate an error if the object does not
belong to the graph

kbrock/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,ellson/graphviz,tkelman/graphviz,jho1965us/graphviz,BMJHayward/graphviz,tkelman/graphviz,jho1965us/graphviz,ellson/graphviz,MjAbuz/graphviz,kbrock/graphviz,BMJHayward/graphviz,jho1965us/graphviz,jho1965us/graphviz,pixelglow/graphviz,tkelman/graphviz,ellson/graphviz,jho1965us/graphviz,tkelman/graphviz,ellson/graphviz,kbrock/graphviz,kbrock/graphviz,tkelman/graphviz,tkelman/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,jho1965us/graphviz,pixelglow/graphviz,ellson/graphviz,kbrock/graphviz,BMJHayward/graphviz,ellson/graphviz,jho1965us/graphviz,pixelglow/graphviz,ellson/graphviz,tkelman/graphviz,ellson/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,kbrock/graphviz,jho1965us/graphviz,pixelglow/graphviz,pixelglow/graphviz,BMJHayward/graphviz,tkelman/graphviz,tkelman/graphviz,pixelglow/graphviz,kbrock/graphviz,jho1965us/graphviz,kbrock/graphviz,pixelglow/graphviz,ellson/graphviz,MjAbuz/graphviz,kbrock/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,pixelglow/graphviz,kbrock/graphviz,jho1965us/graphviz,pixelglow/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,jho1965us/graphviz,MjAbuz/graphviz,pixelglow/graphviz,BMJHayward/graphviz,kbrock/graphviz,BMJHayward/graphviz,tkelman/graphviz,tkelman/graphviz,MjAbuz/graphviz,ellson/graphviz,ellson/graphviz,pixelglow/graphviz,MjAbuz/graphviz