If an exception is raised during evaluation of the Plan's JQL, the Plan will fail to display

Issue Summary

If an exception is raised during evaluation of the Plan's JQL, the ARJ interface will fail to display, giving the global Sorry, we had some technical problems during your last operation. error page

Steps to Reproduce

1. On Jira 8.5.3, Install Script Runner 6.0.2-p5
2. Create a Filter with a Scripted JQL Function, eg issueFunction in linkedissuesofAllRecursive("", "is Epic of")
3. Create some issues, so that the filter would return at least 1 issue
4. Create a Plan, with Issue Source as the filter
5. Disable the Scripted JQL Function used in the filter, eg linkedissuesofAllRecursive in Manage Apps -> Script Runner -> Modules
6. Try to load the Plan

Expected Results

The problem is handled more gracefully, like Agile Board, or even JPOS' own Issue Sources page:

Agile Board:

Actual Results

The interface fails to load at all.

Workaround

Resolve the problem causing the exception