fix test

Author: anidotnet

nitrite/src/test/java/org/dizitart/no2/mapper/MappableDepartment.java

@@ -32,7 +32,7 @@
 @ToString
 public class MappableDepartment implements Mappable {
     private String name;
-    private List<MappableEmployee> employeeList = new ArrayList<>();
+    private List<MappableEmployee> employeeList;
 
     @Override
     public Document write(NitriteMapper mapper) {
@@ -60,4 +60,11 @@ public void read(NitriteMapper mapper, Document document) {
             }
         }
     }
+
+    private List<MappableEmployee> getEmployeeList() {
+        if (employeeList == null){
+            employeeList = new ArrayList<>();
+        }
+        return employeeList;
+    }
 }