`RecordFieldSetMapper` fails with `Record` without components

[scordio]

While working on #4864, I realized that the following:

@Test
void testMapFieldSetWithEmptyRecord() {
	// given
	RecordFieldSetMapper<Empty> mapper = new RecordFieldSetMapper<>(Empty.class);
	FieldSet fieldSet = new DefaultFieldSet(new String[0], new String[0]);

	// when
	Empty empty = mapper.mapFieldSet(fieldSet);

	// then
	assertNotNull(empty);
}

record Empty() {}

fails with:

java.lang.NullPointerException: Cannot read the array length because "this.constructorParameterNames" is null

	at org.springframework.batch.item.file.mapping.RecordFieldSetMapper.mapFieldSet(RecordFieldSetMapper.java:70)
	at org.springframework.batch.item.file.mapping.RecordFieldSetMapperTests.testMapFieldSetWithEmptyRecord(RecordFieldSetMapperTests.java:78)

Whether such a use case makes sense, I'm not sure.

Should this corner case be fixed, or should the mapper reject records without components?