Weather icon missing

[peter-ogden]

Many evenings, our weather bureau returns an "unknown" value. This results in an error in the logs:

SvelteKitError: Not found: /weather/meteocons/unknown-night.svg
at resolve2 (file:///rootfs/build/server/index.js:4168:18)
at resolve (file:///rootfs/build/server/index.js:4001:34)
at Object.handle (file:///rootfs/build/server/chunks/hooks.server-CE3BTx0B.js:2:26)
at respond (file:///rootfs/build/server/index.js:3999:43)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
status: 404,
text: 'Not Found'