added information on 400 Bad Request for empty requests to search

solution.md

@@ -178,6 +178,9 @@ Another thing regarding search is that it seems that for most fields, it does no
 So I limited the search feature to a subset of fields, as described in `SearchFilters` type in [`types.ts`](src/types.ts)
 and in `SearchDto` in [`movies.controller.ts`](src/movies.controller.ts).
 
+And finally, it does not make a lot of sense to search by an empty query (we probably don't want to just list our entire database to whoever
+did not enter any search filters), so I return a 400 Bad Request errors for request to search endpoint with empty query.
+
 ## Testing
 
 I did not have any time to come up with a good test cases, so most tests work on samples of data from OMDB and on provided sample JSONs.