Remove unused variable in testEdgeCaseEmptyPropertyName

Deleted the unused 'idField' variable from the testEdgeCaseEmptyPropertyName method in InterfaceEntityTest to clean up the code.

Author: anidotnet

nitrite/src/test/java/org/dizitart/no2/repository/InterfaceEntityTest.java

@@ -263,8 +263,6 @@ public void testMultipleImplementationsFieldAccess() throws IllegalAccessExcepti
     public void testEdgeCaseEmptyPropertyName() {
         // This tests that our validation works
         scanner.readEntity();
-        ObjectIdField idField = scanner.getObjectIdField();
-        
         Dog dog = new Dog("test", "TestDog");
 
         try {