Fix: invoke callback when geocoding returns empty results

[Copilot]

When withGeocodeCoordinates receives an empty result set from the geocoding API, it logged and returned without ever calling callback, silently stalling the entire fetch chain. This is the same class of bug the location override stabilization PR addresses.

Changes

• src/pkjs/weather/provider.js: Call callback(null, null) in the locations.length === 0 branch so the fetch chain can proceed or fail cleanly

if (locations.length === 0) {
    console.log('[!] No geocoding results')
    callback(null, null);  // was: no callback call — fetch stalled silently
}

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