Steps to repro:

1. Open attached project and 'MaterialTypes' scene;
2. In the Lighting window press 'Generate Lighting' button.

Expected result:
Illegal geometry (containing line and/or point geometry) is ignored and the bake proceeds and finished successfully.

Actual result:
Baking stalls with the following errors:
- `[PathTracer] AddGeometry job with hash: 6dc2d92b85d9b592a751b4d831830fbd failed with exit code 1.'
and
- '[PathTracer] Failed to add geometry; mesh is missing required attribute. Please make sure mesh contains positions, normals and texcoord0.'
See attached video. Regression introduced in 2019.1.0a13.

Notes:
- Reproducible in 2019.2.0a3, 2019.1.0b1, 2019.1.0a13;
- Not reproducible in 2019.1.0a12, 2018.3.3f1;
- Reproducible on Windows and Mac;
- Reproducible only with CPU PLM; not reproducible with Enlighten and GPU PLM.
- In trunk (2019.2.0a3) different error is shown:

'[PathTracer] Failed to add geometry for mesh 'Line001'; mesh is missing required attribute(s). Please make sure the mesh contains at least positions, normals and texcoord0.'

and the baking is still stalled.