NCBACK-33 fix check null user

src/main/java/ru/soune/nocopy/handler/LoginRequestHandler.java

@@ -14,7 +14,6 @@ import ru.soune.nocopy.service.register.AuthService;
 
 import java.util.Arrays;
 import java.util.Map;
-import java.util.Optional;
 
 @Component
 @RequiredArgsConstructor
@@ -31,7 +30,7 @@ public class LoginRequestHandler implements RequestHandler {
         LoginRequest loginRequest = objectMapper.convertValue(request.getMessageBody(), LoginRequest.class);
         User user = userRepository.findByEmail(loginRequest.getEmail());
 
-        if (user != null) {
+        if (user == null) {
             LoginAnswer loginAnswer = new LoginAnswer();
             loginAnswer.setFieldErrors(Arrays.asList(Map.of("email", loginRequest.getEmail())));