Export created before 7.0 can not be modified after migration
Steps:
- Go to 6.8, create an export and save the preset.
- Migrate to 7.0.
- Open the export, select the saved template, add a field, save and override.
- The export report is shown with the new column.
- But if you try to export again, the preset was not saved.
Tested on sao, not tested yet on GTK.