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/controllers/search.controller.ts

@@ -62,6 +62,7 @@ export class SearchController {
   @Get('suggestions')
   @Authenticated()
   getSearchSuggestions(@Auth() auth: AuthDto, @Query() dto: SearchSuggestionRequestDto): Promise<string[]> {
-    return this.service.getSearchSuggestions(auth, dto);
+    // TODO fix open api generation to indicate that results can be nullable
+    return this.service.getSearchSuggestions(auth, dto) as Promise<string[]>;
   }
 }