QmlDesigner: Fix for missing QtQuick import

Fixes: QDS-14828
Change-Id: Id8ed1cd1daf16d0773a4ae0431745ab8956adb6b
Reviewed-by: Aleksei German <aleksei.german@qt.io>
(cherry picked from commit f92524e5d9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp

@@ -410,6 +410,7 @@ void ItemLibraryModel::update(Model *model)
 
             // we need to exclude all items from unsupported imports but only if they are not user-defined modules
             if (!(entry.category() == ItemLibraryImport::userComponentsTitle())
+                && !entry.requiredImport().isEmpty()
                 && !mcuManager.allowedImports().contains(entry.requiredImport())) {
                 blocked = true;
             }