Show warning if qmlviewer is missing

Change-Id: Ie6275ebf6a49f0b1732cc146abeaa23c7b6eafd4
Reviewed-on: http://codereview.qt.nokia.com/1843
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qt4projectmanager/qt-desktop/simulatorqtversion.cpp

@@ -89,6 +89,13 @@ QString SimulatorQtVersion::invalidReason() const
     return tmp;
 }
 
+QString SimulatorQtVersion::warningReason() const
+{
+    if (qtVersion() >= QtSupport::QtVersionNumber(4, 7, 0) && qmlviewerCommand().isEmpty())
+        return QCoreApplication::translate("QtVersion", "No qmlviewer installed.");
+    return QString();
+}
+
 QList<ProjectExplorer::Abi> SimulatorQtVersion::qtAbis() const
 {
     if (!m_qtAbisUpToDate) {