Change handling for new notification.

Make consistent with existing validation failures.

src/main/java/uk/gov/hmcts/probate/exception/RequestInformationParameterException.java

@@ -1,10 +1,10 @@
 package uk.gov.hmcts.probate.exception;
 
-public class RequestInformationParameterException extends RuntimeException {
+public class RequestInformationParameterException extends BusinessValidationException {
     private static final String INVALID_PERSONALISATION_ERROR_MESSAGE =
             "Markdown Link detected in case data, stop sending notification email.";
 
     public RequestInformationParameterException() {
-        super(INVALID_PERSONALISATION_ERROR_MESSAGE);
+        super(INVALID_PERSONALISATION_ERROR_MESSAGE, INVALID_PERSONALISATION_ERROR_MESSAGE);
     }
 }

src/main/java/uk/gov/hmcts/probate/exception/handler/DefaultExceptionHandler.java

@@ -14,7 +14,6 @@
 import uk.gov.hmcts.probate.exception.ConnectionException;
 import uk.gov.hmcts.probate.exception.NotFoundException;
 import uk.gov.hmcts.probate.exception.OCRMappingException;
-import uk.gov.hmcts.probate.exception.RequestInformationParameterException;
 import uk.gov.hmcts.probate.exception.SocketException;
 import uk.gov.hmcts.probate.exception.model.ErrorResponse;
 import uk.gov.hmcts.probate.model.ccd.ocr.ValidationResponse;
@@ -92,22 +91,6 @@ public ResponseEntity<ErrorResponse> handle(ConnectionException exception) {
         return new ResponseEntity<>(errorResponse, headers, SERVICE_UNAVAILABLE);
     }
 
-    @ExceptionHandler(value = RequestInformationParameterException.class)
-    public ResponseEntity<CallbackResponse> handle(RequestInformationParameterException exception) {
-        log.warn("Invalid parameters when sending email", exception);
-
-        final List<String> errors = List.of(exception.getMessage());
-        final CallbackResponse errorResponse = CallbackResponse.builder()
-                .errors(errors)
-                .build();
-        HttpHeaders headers = new HttpHeaders();
-        headers.setContentType(MediaType.APPLICATION_JSON);
-
-        return ResponseEntity.ok()
-                .headers(headers)
-                .body(errorResponse);
-    }
-
     @ExceptionHandler(value = NotFoundException.class)
     public ResponseEntity<ErrorResponse> handle(NotFoundException exception) {
         log.warn("Not found exception", exception);

src/test/java/uk/gov/hmcts/probate/exception/handler/DefaultExceptionHandlerTest.java

@@ -169,7 +169,8 @@ void shouldReturnOCRMappingException() {
     @Test
     void shouldReturnMarkdownError() {
         RequestInformationParameterException ex = mock(RequestInformationParameterException.class);
-        when(ex.getMessage()).thenReturn(EXCEPTION_MESSAGE);
+        when(ex.getMessage()).thenReturn("");
+        when(ex.getUserMessage()).thenReturn(EXCEPTION_MESSAGE);
 
         ResponseEntity<CallbackResponse> response = underTest.handle(ex);