feat(server): search unknown place (#10866)

* Allow submission of null country

* Update searchAssetBuilder to handle nulls

andWhere({country:null}) produces `"exifInfo"."country" = NULL`. We want
`"exifInfo"."country" IS NULL`, so we have to treat NULL as a special
case

* Allow null country in frontend

* Make the query code a bit more straightforward

* Remove unused brackets import

* Remove log message

* Don't change whitespace for no reason

* Fix prettier style issue

* Update search.dto.ts validators per @jrasm91's recommendation

* Update api types

* Combine null country and state into one guard clause

* chore: clean up

* chore: add e2e for null/empty city, state, country search

* refactor: server returns suggestion for null values

* chore: clean up

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>
Co-authored-by: Jason Rasmussen <jason@rasm.me>

server/src/utils/database.ts

@@ -48,7 +48,13 @@ export function searchAssetBuilder(
       ? builder.leftJoinAndSelect(`${builder.alias}.exifInfo`, 'exifInfo')
       : builder.leftJoin(`${builder.alias}.exifInfo`, 'exifInfo');
 
-    builder.andWhere({ exifInfo });
+    for (const [key, value] of Object.entries(exifInfo)) {
+      if (value === null) {
+        builder.andWhere(`exifInfo.${key} IS NULL`);
+      } else {
+        builder.andWhere(`exifInfo.${key} = :${key}`, { [key]: value });
+      }
+    }
   }
 
   const id = _.pick(options, ['checksum', 'deviceAssetId', 'deviceId', 'id', 'libraryId']);