[dummyqml] Minor polishing in Qml module

- document the default filename better
 - mark TODO actually loading the instance-id file

src/libcalamaresui/viewpages/QmlViewStep.cpp

@@ -247,9 +247,10 @@ Calamares::QmlViewStep::setConfigurationMap( const QVariantMap& configurationMap
     QString qmlFile = CalamaresUtils::getString( configurationMap, "filename" );
     if ( qmlFile.isEmpty() )
     {
-        cWarning() << "No QML file for module" << m_name;
+        // TODO use the module instance
     }
-    else if ( !m_qmlComponent )
+
+    if ( !m_qmlComponent )
     {
         m_qmlFileName = searchQmlFile( m_searchMethod, qmlFile, m_name );
 

src/modules/dummyqml/dummyqml.conf

@@ -18,8 +18,11 @@
 # Search mode. Valid values are "both", "qrc" and "branding"
 search: both
 
-# Name of the QML file. If not set, uses the name of the module.
-filename: dummyqml
+# Name of the QML file. If not set, uses the name of the instance
+# of the module (e.g. if you list this module in `settings.conf`
+# in the *instances* section, you get *id*, otherwise it would
+# normally be "dummyqml").
+# filename: dummyqml
 
 qmlLabel:
     notes: "Release Notes"