Problem exporting model initially created using MakeHuman

Hello!
There is a blender model with the character and simple walk animation
[Vasya_2.zip](https://github.com/godotengine/collada-exporter/files/2479921/Vasya_2.zip)
Here is the export settings:
That's how exported DAE file looks like in the Godot:
Mesh does not follow the bones, some parts of the mesh are floating in the air.
Resulting DAE file size is 861 Mb, but it is the less of all evils :)
Another problem with this model: if Shape Keys option is not checked, then the DAE can not be generated at all because of the script crash:
I've checked this with the HEAD version of the exporter in this repository and also in the exporter version that can be downloaded from https://downloads.tuxfamily.org/godotengine/collada-exporter/BetterColladaExporter-latest.zip
I've also tried to export this model to GLTF & escn too, but these attempts failed as well. This animation just can not be exported, and I've ran out of options :(