AutoTest: Fix displaying description for XML output

CDATA is send in chunks and we lose possible newlines as
we handle the output line by line.
Add it explicitly while processing.

Change-Id: I36bad7f23e2b9b3a5ce9ec92d2d1cb6211dd43a6
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/qtest/qttestoutputreader.cpp

@@ -196,6 +196,8 @@ void QtTestOutputReader::processXMLOutput(const QByteArray &outputLine)
             break;
         }
     }
+    if (m_cdataMode == Description)
+        m_xmlReader.addData("\n");
     m_xmlReader.addData(QString::fromUtf8(outputLine));
     while (!m_xmlReader.atEnd()) {
         if (m_futureInterface.isCanceled())