QmlProfiler: displaying events only when available

Change-Id: I65414168804fb9673793409bd66deec501944c75
Reviewed-on: http://codereview.qt.nokia.com/1601
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -162,6 +162,7 @@ Rectangle {
         onComplete: {
             root.dataAvailable = true;
             Plotter.calcFps();
+            if (Plotter.ranges.length > 0) {
                 view.visible = true;
                 view.setRanges(Plotter.ranges);
                 view.updateTimeline();
@@ -170,6 +171,7 @@ Rectangle {
                 rangeMover.x = 0
                 rangeMover.opacity = 1
             }
+        }
 
         onClear: {
             root.clearAll();