Maya: Improve validators for a mesh without geometry (no faces)

[BigRoy]

Changelog Description

Improve validations for meshes without any faces/geometry.

Easiest reproducable is using this python script to create a mesh:

from maya import cmds
cmds.createNode("mesh")

Or to simplify it for publishing:

from maya import cmds
transform = cmds.createNode("transform", name="empty_GEO")
cmds.createNode("mesh", parent=transform, name="empty_GEOShape")

Now publish that mesh as a model with the Validate Mesh NGONs an Validate Mesh UV has map1 UV set validators enabled. Without this PR those validators will error - now they will ignore, or invalidate with PublishValidationError improving the report.

I've also taken the liberty to improve the validation message for the Validate Mesh has map1 UV Set validator

Additional info

We hit an issue where somehow in production where a mesh was broken and had no remaining geometry (likely due to an issue with maya's construction history somewhere). How to reproduce that actual real production scenario, I have no idea. But the code provided above creates a mesh with a 'similar' state.

Note that a mesh without faces/geometry is still invalid - but it's validated by a dedicated validator generating a better report.

Testing notes:

1. Enable validators:

ayon+settings://maya/publish/ValidateMeshUVSetMap1
ayon+settings://maya/publish/ValidateMeshNgons

2. Validate the 'broken mesh' from the reproducable
3. A nice report should be visible instead of the "this is not your fault" error.

[tokejepsen]

In latest develop with those validator enabled I get this when publishing the empty mesh:

So I dont think the testing notes work.

[BigRoy]

In latest develop with those validator enabled I get this when publishing the empty mesh:

So I dont think the testing notes work.

Are you sure the validators are enabled? Can you see them having run in Details tab?

This is what I get (latest develop + Maya 2024):

Then if I disable NGONs validation, but only enable the other Validate Mesh Has map1 uv set:

[LiborBatek]

LGTM

After hitting Repair the geometry is converted to empty transform which gives me different Validate error, which seems also correct to me

[moonyuet]

code looks good to me.

[tokejepsen]

Tested successfully in Maya 2023.