Fixing the default knn value in the AMSC_Object and ensuring that we can't have an empty graph.
Fixing the default knn value in the AMSC_Object and ensuring that we can't have an empty graph.

joshua-cogliati-inl/raven,idaholab/raven,idaholab/raven,idaholab/raven,joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,idaholab/raven,joshua-cogliati-inl/raven,idaholab/raven,joshua-cogliati-inl/raven,idaholab/raven,idaholab/raven