Blender importer failing to import files that used to work

[jamesdolan]

When updating to latest master, Blender files that used to load no longer do with error output similar to the following...

assimp: Info,  T0: Load $$$___magic___$$$.
assimp: Info,  T0: Found a matching importer for this file format: Blender 3D Importer 
http://www.blender3d.org.
assimp: Info,  T0: Import root directory is './'
assimp: Info,  T0: BLEND: Blender version is 2.79 (64bit: true, little endian: true)
assimp: Info,  T0: BlenderDNA: Dumped dna to dna.txt
assimp: Warn,  T0: <add reason>
assimp: Skipping one or more lines with the same contents
assimp: Warn,  T0: BlendDNA: Did not find a field named `flags` in structure `Lamp`
assimp: Info,  T0: (Stats) Fields read: 701060, pointers resolved: 269, cache hits: 17166, cached objects: 113
**assimp: Error, T0: Validation failed: The mesh SomeMeshName contains no vertices**

...and if I open the file in blender and look at the offending mesh (e.g. 'SomeMeshName') does indeed have verts (44 tris, 84 verts). And if I roll back to an older assimp, the particular mesh in question does get loaded without issue and is visible.

Previously was using this version: https://github.com/assimp/assimp/tree/45892d7fe99c6c35d89f491af43f313e84e1e395

[jamesdolan]

Attached is a file that reproduces the issue.
test.blend.zip

[CwTCwT]

can/should i check this issue (reproduce and find the bug)?
maybe related to my fix, added unit test and checking

[CwTCwT]

@jamesdolan i issued a pullrequest to solve this issue, caused by newly added CustomData support (base cause is somehow strange design: number of vertices (re)set when setting UVs, i commented the belonging part in the CustomData pullrequest).
verified number of faces (44) but number of vertices were different in unittests result (132 <> 84), assuming you used some setting to minimize number of result vertices.
in unittest file is only loaded with aiProcess_ValidateDataStructure.
added your blender file to unittest, hope this is ok?!
every additional blend file to support unittesting makes the lib better and more reliable.
#2022

[jamesdolan]

Thanks! For reference my loading flags are aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_PreTransformVertices