DocumentTest.vala: invalid characters no longer cause create_element to return...

DocumentTest.vala: invalid characters no longer cause create_element to return null, so don't test for it

test/DocumentTest.vala

@@ -128,7 +128,7 @@ class DocumentTest : GXmlTest {
 
 				elem = doc.create_element ("ØÏØÏدÏØÏ  ²øœ³¤ïØ£");
 				test_error (DomException.INVALID_CHARACTER);
-				assert (elem == null);
+				// assert (elem == null); // TODO: decide what we want returned on DomExceptions
 			});
 		Test.add_func ("/gxml/document/create_document_fragment", () => {
 				try {