NAS-131293 / 25.04 / fix regression in alerts

[yocalebo]

A subtle typo is causing this crash on HA. It's happening because I'm appending a list to a list.

[2024/09/18 10:25:58] (ERROR) middlewared.job.run():504 - Job <bound method AlertService.process_alerts of <middlewared.plugins.alert.AlertService object at 0x7f2ac1ecd7d0>> failed
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/middlewared/job.py", line 489, in run
    await self.future
  File "/usr/lib/python3/dist-packages/middlewared/job.py", line 534, in __run_body
    rv = await self.method(*args)
         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/plugins/alert.py", line 494, in process_alerts
    await self.__run_alerts()
  File "/usr/lib/python3/dist-packages/middlewared/plugins/alert.py", line 774, in __run_alerts
    oalert.node = fi.other_node
    ^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'node'

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-131293

[bugclerk]

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