Unable to export traceability report to CSV when report settings are stored/loaded

Currently, it is not possible to export the report to CSV if the filters are loaded from the stored configuration.

To be able to export the report with filters the user must:

1. clear the filters
2. generate the report (to save the new configuration)
3. reload the report
4. reapply the filters

-> now it should be possible to export.

Steps to reproduce the bug:

1. Go to traceability report, configure a filter using an advanced JQL search.
2. Generate the report.
3. Reload the page -> The filter is loaded into the report.
4. Generate report -> the Export button is disabled.
5. Toggle one of the quick filters -> the Export button is now enabled. Click to export: nothing happens.

An error is present on the browser console: