Fixed after second review

Author: savchenkoarts

src/main/java/mate/academy/rickandmorty/controller/CharacterController.java

@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
-import jakarta.validation.constraints.NotBlank;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import mate.academy.rickandmorty.dto.internal.CharacterConversionDto;
@@ -29,7 +28,6 @@ public CharacterConversionDto getRandomCharacter() {
     @Operation(summary = "Search characters", description = "Search characters")
     public List<CharacterConversionDto> searchCharacters(
             @RequestParam
-            @NotBlank(message = "Search parameter cannot be blank!")
             String searchParameter) {
         return service.searchCharacters(searchParameter);
     }

src/main/java/mate/academy/rickandmorty/service/CharacterServiceImpl.java

@@ -30,7 +30,7 @@ public CharacterConversionDto getRandomCharacter() {
 
     @Override
     public List<CharacterConversionDto> searchCharacters(String searchParameter) {
-        if (searchParameter.isEmpty()) {
+        if (searchParameter.isBlank()) {
             throw new EntityNotFoundException(
                     "Search parameter cannot be blank or empty. "
                             + "Please provide a valid search query."