Implemented case that demonstrates MongoQueryCreator throwing an NPE when a jpa method with IgnoreCase (or AllIgnoreCase) is invoked with a null argument

Author: EdwardPrentice

complete/src/main/java/hello/Application.java

@@ -36,6 +36,9 @@ public void run(String... args) throws Exception {
 		System.out.println("Customer found with findByFirstName('Alice'):");
 		System.out.println("--------------------------------");
 		System.out.println(repository.findByFirstName("Alice"));
+		System.out.println(repository.findByFirstName(null)); // returns null
+		System.out.println(repository.findByFirstNameIgnoreCase("ALICE")); // returns the 'Alice' user - proof that it can work
+		System.out.println(repository.findByFirstNameIgnoreCase(null)); // NullPointerException from MongoQueryCreator.java:302
 
 		System.out.println("Customers found with findByLastName('Smith'):");
 		System.out.println("--------------------------------");

complete/src/main/java/hello/CustomerRepository.java

@@ -7,6 +7,7 @@
 public interface CustomerRepository extends MongoRepository<Customer, String> {
 
     public Customer findByFirstName(String firstName);
+    public Customer findByFirstNameIgnoreCase(String firstName);
     public List<Customer> findByLastName(String lastName);
 
 }