Editor Crash When using ArrayMesh/PointMesh on the VoxelBockyModelMesh

[EarthDLL]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Build:https://github.com/EarthDLL/godot_voxel/actions/runs/6836074952

Steps to reproduce the behavior:

1. Create a VoxelBlockyModelMesh
2. Create a ArrayMesh and use Script to add surface to the Mesh(Empty ArrayMesh will not cause crashing)
3. Adding ArrayMesh to BockyModelMesh or creating a new pointMesh directly can cause a crash

Screenshots https://github.com/Zylann/godot_voxel/assets/100025289/b2920f63-52f2-4e48-abca-100ca1555135

https://github.com/Zylann/godot_voxel/assets/100025289/78e9b0a4-85bc-47d1-8893-5f93393c3b83

Environment

• OS: Windows 10(64bit)
• Graphics card : NVIDIA GeForce MX330
• Godot 4.1.4rc.custom_build
• Module version (or commit hash if you got it from Github directly)
• Renderer used: Mobile & Opengl3

[Zylann]

Meshes made only of vertices (and no UVs, no normals, no indices) are not supported. It must also be triangles. It should not crash though, instead it should show an error. That should be fixed.

Note, please don't post screenshots of code. It prevents me from copying it to try it. Ideally, post a minimal reproduction project.

[Zylann]

Added more checks in 67a6f0c65c8754a5b740fc5aef8e511967aa875d so it should no longer crash.

[EarthDLL]

Thanks