AutoTest: Show results for debugging tests as well

At least display results for using gdb or lldb and inform
user that we are not able to do so when using cdb.

Task-number: QTCREATORBUG-16693
Change-Id: I1a98a79aaf76de47b5dcb58d4dca9247f1642d36
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/qtest/qttestoutputreader.cpp

@@ -142,6 +142,9 @@ void QtTestOutputReader::processOutput(const QByteArray &outputLine)
                                         QStringLiteral("QtBuild"),
                                         QStringLiteral("QTestVersion") };
 
+    if (m_className.isEmpty() && outputLine.trimmed().isEmpty())
+        return;
+
     m_xmlReader.addData(outputLine);
     while (!m_xmlReader.atEnd()) {
         if (m_futureInterface.isCanceled())