Fixed: Fix #144 in cases where the entity's Pos is NaN but the entity also has xTile, yTile, zTile fields.
Fixed: Fix #144 in cases where the entity's Pos is NaN but the entity also has xTile, yTile, zTile fields.

arruda/pymclevel,mcedit/pymclevel,ahh2131/mchisel,mcedit/pymclevel,arruda/pymclevel,ahh2131/mchisel