readded is not none statements

[codecov[bot]]

Codecov Report

Merging #127 into master will not change coverage by %. The diff coverage is 91.17%.

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   98.03%   98.03%           
=======================================
  Files          50       50           
  Lines        4062     4062           
  Branches      754      754           
=======================================
  Hits         3982     3982           
  Misses         36       36           
  Partials       44       44           

Impacted Files	Coverage Δ
...o_mesh_w3d/common/structs/mesh_structs/aabbtree.py	99.20% <0.00%> (ø)
io_mesh_w3d/common/utils/mesh_export.py	90.87% <0.00%> (ø)
io_mesh_w3d/common/utils/hierarchy_export.py	98.59% <66.66%> (ø)
io_mesh_w3d/common/structs/hlod.py	97.19% <100.00%> (ø)
io_mesh_w3d/common/structs/mesh.py	95.77% <100.00%> (ø)
io_mesh_w3d/common/structs/mesh_structs/texture.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/helpers.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/hierarchy_import.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/material_export.py	96.77% <100.00%> (ø)
io_mesh_w3d/common/utils/mesh_import.py	98.61% <100.00%> (ø)
... and 2 more

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