Show the playlist when empty area is clicked and there is no media playing.

Patch by Ashish Madeti <ashishmadeti@gmail.com>

BUG: 322820
REVIEW: 116620

shells/newshell/package/contents/ui/mediacenter.qml

@@ -147,7 +147,7 @@ Image {
                     pmcPageStack.pushAndFocus(getMediaBrowser());
                     runtimeData.currentBrowsingBackend = selectedBackend;
                 }
-                onEmptyAreaClicked: if (mediaPlayerInstance) pmcPageStack.pushAndFocus(getMediaPlayer());
+                onEmptyAreaClicked: pmcPageStack.pushAndFocus(mediaPlayerInstance ? getMediaPlayer() : getPlaylist())
 
                 onStatusChanged: {
                     switch (status) {