CircleNode error checking.
CircleNode error checking.

svn path=/trunk/libavg/; revision=3760

hoodie/libavg,libavg/libavg,th3infinity/libavg,yyd01245/libavg,th3infinity/libavg,yyd01245/libavg,scotty007/libavg,scotty007/libavg,scotty007/libavg,yyd01245/libavg,hoodie/libavg,hoodie/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,libavg/libavg,th3infinity/libavg,libavg/libavg,libavg/libavg,scotty007/libavg