ID 407751 - An error is given when the OCIO environment variable is set and viewing the OCIOFileTransform node.

Problem summary:
An error is given when the OCIO environment variable is set and viewing the OCIOFileTransform node.

Customer reported version:
Nuke 12.0v1

Customer reported platform:
CentOS 7.4

Steps to reproduce:

1) From the command prompt/terminal, set the environment variable OCIO= C:/Program Files/Nuke12.0v1/plugins/OCIOConfigs/configs/aces_1.0.3/config.ocio

2) Launch Nuke from the command prompt.

3) Press Tab and type OCIOFileTransform then Enter to add the node.

4) View the node and any errors given.

Expected behavior:
The OCIOFileTransform node should be unable to error when the OCIO environment variable is set.

Actual behavior:
The error "BuildColorSpaceOps failed, null srcColorSpace" is given when the OCIO environment variable is set. This error has also been seen to occur when setting a custom OCIO via the Project Settings (S) Color menu.

Workaround: 
Ensure the colorManagement knob in the script Project Settings is set to ‘OCIO’.

Reproduced by Support in:
Nuke 12.0v1 - Windows 10, CentOS 7, macOS 10.13 - regression

Unable to reproduce bug in:
Nuke 11.3v5 - Windows 10, CentOS 7, macOS 10.13

Earliest version tested
Nuke 11.3v5 - This issue doesn't appear in this version and has regressed