Avoid warning with no IsotropicMetricTensorLength inputArrayToProcess.
requested to merge bjacquet/paraview:fix/GeodisicPlugin_avoid_warning_when_no_isometric_tensor into master
Avoid warning with no IsotropicMetricTensorLength or no NonZeroField inputArrayToProcess.. When no NonZeroField, SetSeeds should have been called (this should not happen with ParaView, but can happen if compiled only in VTK).
Edited by Mathieu Westphal (Kitware)