Fixed an issue where article list pages could throw an error for invalid filters #4517
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The new article list views (Relying on GenericFacetedListView) rely on GET method to apply filtering. They use a django form to render facets and filters, however the form was not being validated, leading to server errors and potential SQL injection when malformed data was sent via query parameters. We now validate all query parameters ahead of executing any queries.
closes #4497