Vertices with no weights in-game (OK in Blender)

[Brachi]

When exporting a custom made model, I've noticed some vertices appearing in-game like they have no weights, but in Blender they look OK.
Turns out that MTFramework will ignore the weights completely if one vertex has no weights, even when the others sum up to 255.
Simple example to reproduce:

# bone_index/weight value pairs from Blender
[(47, 0.0021963752806186676), (53, 0.5013832449913025), (57, 0.0008065812289714813), (58, 0.36875882744789124)]
# After processing them for export, bone_index 57 has no influence
[(47, 1), (53, 146), (57, 0), (58, 108)]

So, weights exported have to:

1. Have values sum up to exactly 255
2. Have values be non-zero