Tests.QmlDesigner: fix testRewriterErrors

Error {} was not an Error anymore since we ignore unknown types.
Rectangle does not have the property test. This triggers an error.

Change-Id: I838b12ba15c394a34f6f9176e5eb5826d54b0f2b
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

tests/auto/qml/qmldesigner/coretests/tst_testcore.cpp

@@ -295,7 +295,6 @@ void tst_TestCore::testRewriterView()
 
 void tst_TestCore::testRewriterErrors()
 {
-    QSKIP("Rewriter has problems with the Error item", SkipAll);
     QPlainTextEdit textEdit;
     textEdit.setPlainText("import QtQuick 1.1;\n\nItem {\n}\n");
     NotIndentingTextEditModifier textModifier(&textEdit);
@@ -314,7 +313,7 @@ void tst_TestCore::testRewriterErrors()
     model->attachView(testRewriterView.data());
 
     QVERIFY(testRewriterView->errors().isEmpty());
-    textEdit.setPlainText("import QtQuick 1.1;\n\nError {\n}\n");
+    textEdit.setPlainText("import QtQuick 1.1;\nRectangle {\ntest: blah\n}\n");
     QVERIFY(!testRewriterView->errors().isEmpty());
 
     textEdit.setPlainText("import QtQuick 1.1;\n\nItem {\n}\n");