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/services/search.service.spec.ts

@@ -1,4 +1,5 @@
 import { mapAsset } from 'src/dtos/asset-response.dto';
+import { SearchSuggestionType } from 'src/dtos/search.dto';
 import { IAssetRepository } from 'src/interfaces/asset.interface';
 import { ILoggerRepository } from 'src/interfaces/logger.interface';
 import { IMachineLearningRepository } from 'src/interfaces/machine-learning.interface';
@@ -95,4 +96,22 @@ describe(SearchService.name, () => {
       expect(result).toEqual(expectedResponse);
     });
   });
+
+  describe('getSearchSuggestions', () => {
+    it('should return search suggestions (including null)', async () => {
+      metadataMock.getCountries.mockResolvedValue(['USA', null]);
+      await expect(
+        sut.getSearchSuggestions(authStub.user1, { includeNull: true, type: SearchSuggestionType.COUNTRY }),
+      ).resolves.toEqual(['USA', null]);
+      expect(metadataMock.getCountries).toHaveBeenCalledWith(authStub.user1.user.id);
+    });
+
+    it('should return search suggestions (without null)', async () => {
+      metadataMock.getCountries.mockResolvedValue(['USA', null]);
+      await expect(
+        sut.getSearchSuggestions(authStub.user1, { includeNull: false, type: SearchSuggestionType.COUNTRY }),
+      ).resolves.toEqual(['USA']);
+      expect(metadataMock.getCountries).toHaveBeenCalledWith(authStub.user1.user.id);
+    });
+  });
 });