Extract FBX or layout: Avoid IndexError if object name does not contain :

[BigRoy]

Changelog Description

Extract FBX or layout: Avoid IndexError if object name does not contain :

Additional review information

Fix #45

Testing notes:

This may only work with Blender versions 4.1 and lower, see: #45 (comment) and may need additional fixes for Blender 4.1+

1. Load some rig and animate it
2. Create Animation publish instance
3. Enable FBX optional flag for extracting FBX too
4. Publish should succeed