Android: Fix AVD display if there are no AVDs

Fix that a broken dummy item was shown in the AVD Manager tab in the
Android options, if no AVD is available.

Fixes: QTCREATORBUG-19338
Change-Id: I31550812c332ff78d107d79682e064aa9eae1070
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

tests/auto/android/tst_avdmanageroutputparser.cpp

@@ -45,6 +45,9 @@ void tst_AvdManagerOutputParser::parse_data()
     QTest::addColumn<AndroidDeviceInfoList>("output");
     QTest::addColumn<QStringList>("errorPaths");
 
+    QTest::newRow("none") << "Available Android Virtual Devices:\n"
+                          << AndroidDeviceInfoList() << QStringList();
+
     QTest::newRow("one") << "Available Android Virtual Devices:\n"
                             "    Name: Test\n"
                             "  Device: Galaxy Nexus (Google)\n"