ID 266327 - Dragging audio files on an audio only timeline deletes the tracks

Problem summary
Dragging audio files on an audio only timeline deletes the tracks

Customer reported platform
10.11

Steps to reproduce

1) Open NukeStudio

2) Import a wav file, and it to multiple tracks in the same sequence

3) Delete the Video track

4) Drag a lower track onto an upper track and move the mouse around, the tracks will be replaced with blank ones. See attached video for example.

Workaround
Leave a video track in the timeline, as it doesn't seem to happen with a video track in the time line

Reproduced by support
This problem has been reproduced on:
Nuke 10.5v2 - Windows 10 - CentOS 6.8 - MacOSX 10.12
Nuke 10.5v1 - Windows 10 - CentOS 6.8 - MacOSX 10.12
Nuke 10.0v6 - Windows 10 - CentOS 6.8 - MacOSX 10.12
Nuke 10.0v1 - Windows 10
Nuke 9.0v9 - Windows 10
Nuke 9.0v1 - Windows 10

Expected behaviour
For Nuke to not delete tracks because of moving a track

Actual behaviour
It deleted the tracks