DATAJPA-363 - Improved implementation of SimpleJpaRepository.delete(ID id).

Remove the additional call to exists(…) in favor of a null check, we'd have to trigger anyway in the case of and exists success. This will avoid triggering an additional query.

src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java

@@ -125,12 +125,14 @@ public class SimpleJpaRepository<T, ID extends Serializable> implements JpaRepos
 
 		Assert.notNull(id, "The given id must not be null!");
 
-		if (!exists(id)) {
+		T entity = findOne(id);
+
+		if (entity == null) {
 			throw new EmptyResultDataAccessException(String.format("No %s entity with id %s exists!",
 					entityInformation.getJavaType(), id), 1);
 		}
 
-		delete(findOne(id));
+		delete(entity);
 	}
 
 	/*