Gracefully handle invalid operators and associations requested in queries
|Assignee:||Go MAEDA||% Done:|
Users can request arbitrary operators or custom field associations for fields in queries for issues or time entries. This is validated in the
Query class with an exception being raised if an invalid operator or custom field association was requested.
The attached patch handles this case by raising a named Error instead and gracefully handling this error in the UI by logging the original exception and rendering a 404 error.