Filter Disappears when user makes changes on Metadata Filter Plugins

Tested in version 1.5.0-SNAPSHOT-5f624be

Description

When editing a metadata provider, checking/unchecking box for 'Require Signed Root' on Metadata Filters Plugin page, any/all filters are deleted.

Steps

Prerequisite:

1. Log into app
2. Create and Save a Metadata Provider using 'FileBackedHttpMetadataProvider'
3. Add a Filter
4. Save
5. Verify Filter was saved

Issue:

1. Click Metadata Providers tab
2. Click 'Edit' button for the metadata provider
3. Select the Metadata Filters tab on left nav
4. Make any change on the Metadata Filter Plugins Page
5. Click 'Save'
6. Go back to see Filter, it is gone

Video: Filter Disappears