StatsGenerator computes NaN values for standard deviation in the neighbor distribution if bincount is large enough

[cartercocke]

The StatsGenerator filter computes NaN values for the standard deviation within the neighbor distribution when the number of bins is 14 or more (in the case of equiaxed grains) or 8 or more (in the case of rolled grains). The problem occurs in the following areas where the log of a negative number is evaluated giving a NaN value (or log(0) = -inf).

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/Presets/PrecipitateEquiaxedPreset.cpp#L157

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/Presets/PrimaryRecrystallizedPreset.cpp#L155

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/Presets/PrecipitateEquiaxedPreset.cpp#L157

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/Presets/PrimaryRolledPreset.cpp#L154

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/Presets/PrecipitateRolledPreset.cpp#L153

I'm not sure how this carries forward beyond the Stats Generator filter as the Pack Primary Phases filter still works with these NaN values, but I figured it was worth noting as a potential issue. I believe these neighbor distribution statistics are used here:

https://github.com/BlueQuartzSoftware/DREAM3D/blob/2f6b5aeaa6e62672e1d65ec4557a261cfbdb8eed/Source/Plugins/SyntheticBuilding/SyntheticBuildingFilters/PackPrimaryPhases.cpp#L1376