ID 266688 - Live rendering does not send update on deleted attributes [Duplicate of TP 248541]

Problem summary:

If all of the attributes being monitored by a LiveRenderFilter op are deleted, no update will be sent to the render plug-in. If multiple attributes are being monitored by a single op updates will be sent correctly when those attributes are deleted providing at least one of them still exists.

Steps to reproduce:

1. Open the attached scene (liveRenderNoUpdateOnDeletedAttribute.katana)
2. Open up the Live Render Monitor tab (from Dev-Resources)
3. ​​​Start a live render from the "Wibble_in_Live_Render" node
4. Mark /root/world/geo/pony as “included” in the live render updates column of the scene graph tab
5. Disable the "setWibble" node in the Node Graph. Notice that no update will come through for the deleted attribute.
6. Enable the "setWibble" node again, and notice that an update is sent.

Expected behaviour:

When all monitored attributes are deleted an empty update should be sent to the renderer, indicating that the group changed.

Actual behaviour:

No indication that the attribute has been deleted occurs.

Workaround:

have LiveRenderFilter ops always monitor another attribute that is guaranteed to exist as well as the desired attributes.

Reproduced versions/platforms:

• 2.0v1

Customer version/platform:

Not supplied.