only set data that was explicitly connected to the dataengine

(some dataengines are a bit too exuberant in sending stuff, like the images of microblog)

svn path=/trunk/KDE/kdebase/runtime/; revision=1216008

declarativeimports/core/datasource.cpp

@@ -139,7 +139,10 @@ void DataSource::setupData()
 
 void DataSource::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
 {
+    //it can arrive also data we don't explicitly connected a source
+    if (m_connectedSources.contains(sourceName)) {
         m_data.insert(sourceName.toLatin1(), data);
+    }
 
     emit dataChanged();
     emit newData(sourceName, data);