added line to gmres_prolongation_smoothing() in smooth.py to remove divide by zero warning during unit tests...this wasn't an error, just an annoying warning during the unit tests
added line to gmres_prolongation_smoothing() in smooth.py to remove divide by zero warning during unit tests...this wasn't an error, just an annoying warning during the unit tests

pyamg/pyamg,huahbo/pyamg,kidaa/pyamg,huahbo/pyamg,kidaa/pyamg,huahbo/pyamg,kidaa/pyamg,huahbo/pyamg,pyamg/pyamg,kidaa/pyamg,pyamg/pyamg