DATACMNS-867 - RepositoryInvoker now returns an Optional for invokeFindOne(…).

Adapted ReflectionRepositoryInvoker to transparently unwrap other potentially used wrapper types to then convert the result into an Optional.

src/main/java/org/springframework/data/querydsl/QuerydslRepositoryInvokerAdapter.java

@@ -17,6 +17,7 @@ package org.springframework.data.querydsl;
 
 import java.io.Serializable;
 import java.lang.reflect.Method;
+import java.util.Optional;
 
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
@@ -125,7 +126,7 @@ public class QuerydslRepositoryInvokerAdapter implements RepositoryInvoker {
 	 * @see org.springframework.data.repository.support.RepositoryInvoker#invokeFindOne(java.io.Serializable)
 	 */
 	@Override
-	public <T> T invokeFindOne(Serializable id) {
+	public <T> Optional<T> invokeFindOne(Serializable id) {
 		return delegate.invokeFindOne(id);
 	}