Hermes features are not available for non-GW nonlocalized events

[griffin-h]

Describe the bug
We would like to use the tom_nonlocalizedevents app to ingest alerts from other types of nonlocalized events. In this case, I give an example of an x-ray transient from the Einstein Probe: EP241201a. I understand that not all the page templates are set up to handle non-GW events (e.g., the parameters at the top and the GraceDB images); this is not the subject of the current issue. However, one of the best features of tom_nonlocalizedevents is its integration with Hermes to display related GCN circulars. This does not currently seem to work for non-GW events, but I am not sure if the issue is with tom_nonlocalizedevents or with Hermes itself.

To Reproduce
Steps to reproduce the behavior:

1. Create a nonlocalized event that is not a gravitational wave, e.g., EP241201a.
2. From the nonlocalized event list, click on that event name to go to its detail page.
3. See that no Hermes messages are listed in the table on the detail page.
4. Back on the nonlocalized event list, click on the Hermes link.
5. See the error message on Hermes that this nonlocalized event does not exist

Expected behavior
As for GW events, I would expect these events to have Hermes messages listed on their detail pages. For this particular event, I see three related GCN circulars in Hermes. I confirmed that the eventId field is being parsed correctly in the "extra keypairs" section.

Screenshots

Desktop (please complete the following information):

• OS: macOS Sequoia 15.1.1
• Browser: Firefox 133.0
• Python Version: 3.10.12

Additional context
For the time being, I'm using event_type=UNKNOWN for these x-ray transients, as the only other choices are GRB, GW, or neutrino. This is probably not causing the problem, but I mention it for debugging purposes.