MINOR: Fixed test that was relying on bug fixed in r101116 (from r101…

…132)

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@111639 467b73ca-7a2a-4603-9d3b-597d59a354a9

tests/CommentAdminTest.php

@@ -32,7 +32,7 @@ function testdeletemarked(){
 		$result = $this->get("admin/comments/EditForm/field/Comments/item/$id/delete");
 		$checkComm = DataObject::get_by_id('PageComment',$id);
 
-		$this->assertNull($checkComm);
+		$this->assertFalse($checkComm);
 	}
 
 }