ID 235024 - Unable to export if project was saved (after export) with custom export preset that is not available.

Problem summary
Unable to export if project was saved (after export) with custom export preset that is not available.  Specifically, Nuke Studio/Hiero unable to export anything if there is unknown preset data in the ExportHistory section of the hrox file.

"Error! Task type <preset> Not recognised"

Customer reported version
nuke.9.0v8 / nuke.11.0v2

Customer reported platform
windows8 / Centos7

Steps to reproduce

1.Open Nuke Studio, start a new project

2.Import a Clip and drag it to the Timeline

3.Click on the clip in the Timeline and choose export, and do an export with one of Studio's defaults

4.Save the project and exit Studio

5.Edit the .hrox project file and find the section between these tags

  <ExportHistory>

  </ExportHistory>

Replace it with this

<data><![CDATA[<root presetname="TEST EXPORTER" tasktype="testModule.testProcessor.TESTPROC"></root>]]></data>

and re-save the .hrox

6.Open Studio, open the previous project (the one whose .hrox you editted)

7.Try the same export

You'll get this error

ERROR 12:27:56.655:Hiero(8903): Error! Task type testModule.testProcessor.TESTPROC Not recognised 

Workaround
Edit the .hrox to remove the text between 

  <ExportHistory>

  </ExportHistory>

Reproduced by support

Support repro'd on OS 10.10.5 in Nuke Studio/Hiero

9.0v8

10.0v4

Expected behaviour
Export.

Actual behaviour
"Error! Task type <preset> Not recognised"