Fix search crash when favicons are malformed

- Did a fresh sync with an existing account and noticed search didn't work. Traced it down to the favicons, which seem like they were not properly re-synced, where one had a doc but without the Blob `favIcon` key. This code assumed it was always present, thus i've removed that assumption

src/search/background/index.ts

@@ -883,10 +883,12 @@ export default class SearchBackground {
  .bulkGet(hostnames)
 
  const favIconDataURLs = await Promise.all(
- favIcons.filter(Boolean).map(async (f) => ({
- hostname: f.hostname,
- favIconDataURL: await blobToDataURL(f.favIcon),
- })),
+ favIcons
+ .filter((f) => f?.favIcon != null)
+ .map(async (f) => ({
+ hostname: f.hostname,
+ favIconDataURL: await blobToDataURL(f.favIcon),
+ })),
  )
  const favIconByHostname = fromPairs(
  favIconDataURLs.map((f) => [f.hostname, f.favIconDataURL]),