ID 440626 - DEFAULT_RENDERER is set to 'dl' if not defined

Problem summary
DEFAULT_RENDERER is set to 'dl' if not defined, even if 3Delight is not available in the Katana environment

Customer reported version
Katana N/A

Customer reported platform

Steps to reproduce

1) Load Katana with RenderMan whilst DEFAULT_RENDERER is not set

2) Create a NetworkMaterialCreate in the Node Graph

3) Enter the NMC and press the Tab key to open node creation menu

Expected behaviour
The node creation menu is populated with Pxr* node types

Actual behaviour
Only default Katana node types are available and the following error is thrown:

[WARN python.RenderPlugins]: GetInfoPlugin(): Renderer plug-in "dl" not found.

Workaround
Switch renderers using Shift+Tab shortcut in the context of NetworkMaterialCreate and NetworkMaterialEdit nodes to change renderer

Reproduced by support

This bug has been reproduced in:
3.6v1 - CentOS - Windows 10

3.5v3 - CentOS - Windows 10

3.5v1 - CentOS - Windows 10

3.2v4 - CentOS - Windows 10

3.2v1 - CentOS - Windows 10

Earliest version tested
3.2v1 - This feature did not exist before this version