Revert "QmlDesigner: Ensure not every type is valid"

This reverts commit 107d2423a3.

Reason for revert: breaks binding editor
Task-number: QDS-15526

Change-Id: I92933f4eba8357eaad35a07b13c513cebdb8807d
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/libs/designercore/metainfo/nodemetainfo.cpp

@@ -837,7 +837,6 @@ NodeMetaInfoPrivate::NodeMetaInfoPrivate(Model *model, TypeName type, int maj, i
 
                 m_objectValue = getObjectValue();
                 m_defaultPropertyName = context()->defaultPropertyName(objectValue).toUtf8();
-                if (m_objectValue)
                 m_isValid = true;
                 setupPrototypes();
             }