Make the multimedia examples less verbose

Important warnings such as missing services are still printed though.

Task-number: QTBUG-31080
Change-Id: I96fd3837c4edc58c61b97bf950b7cab05ceed014
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

src/imports/multimedia/qdeclarativeradiodata.cpp

@@ -281,6 +281,9 @@ void QDeclarativeRadioData::_q_availabilityChanged(QMultimedia::AvailabilityStat
 
 void QDeclarativeRadioData::connectSignals()
 {
+    if (!m_radioData)
+        return;
+
     connect(m_radioData, SIGNAL(programTypeChanged(QRadioData::ProgramType)), this,
                                  SLOT(_q_programTypeChanged(QRadioData::ProgramType)));