CSV export in save filter will fail if the picker field added into the available columns does not have a context that applies to the current filter.

Tested with: Issue picker and LDAP picker

Steps to Reproduce

• Create two new projects (Proj1 and Proj2) and a single issue in Proj1.
• Create an issue picker scripted field and set the context and screens to just Proj2.
• Create a saved filter that only shows issues in Proj1. e.g: `project = Proj1` and then navigate to that filter and change to list view mode.
• Add the issue picker scripted field (belonging to Proj2) as one of the columns.
• Click on Export > CSV (Current fields)

Expected Behaviour

CSV will be downloaded successfully.

Actual Behaviour

CSV failed to download with "Failed - Network error"