Tst_QOpcUaClient::initTestCase fails in '5.13'

agent:2019/04/07 18:06:10 build.go:192: ********* Start testing of Tst_QOpcUaClient *********
agent:2019/04/07 18:06:10 build.go:192: Config: Using QtTest library 5.13.0, Qt 5.13.0 (i386-little_endian-ilp32 shared (dynamic) release build; by MSVC 2017)
agent:2019/04/07 18:06:10 build.go:192: QDEBUG : Tst_QOpcUaClient::initTestCase() Using SDK plugin: "uacpp"
agent:2019/04/07 18:06:10 build.go:192: QDEBUG : Tst_QOpcUaClient::initTestCase() Using SDK plugin: "open62541"
agent:2019/04/07 18:06:14 build.go:192: QDEBUG : Tst_QOpcUaClient::initTestCase() Using endpoint: "opc.tcp://127.0.0.1:43344"
agent:2019/04/07 18:06:15 build.go:192: FAIL! : Tst_QOpcUaClient::initTestCase() 'desc.size() > 0' returned FALSE. ()
agent:2019/04/07 18:06:15 build.go:192: tst_client.cpp(615) : failure location
agent:2019/04/07 18:06:15 build.go:192: PASS : Tst_QOpcUaClient::cleanupTestCase()
agent:2019/04/07 18:06:15 build.go:192: Totals: 1 passed, 1 failed, 0 skipped, 0 blacklisted, 4880ms

Build log: https://testresults.qt.io/logs/qt/qtopcua/8340dcd3badbc8e9e0d2546681ecd059ed379da2/WindowsWindows_10x86_64WindowsWindows_10x86MSVC2017qtci-windows-10-x86_64-14-1a06e8DebugAndRelease_Release_ForceDebugInfo_OpenGLDynamic/f88bde837b2c49c7005eafa54e4c811d0b1ec19f/test_1554464942/log.txt.gz

Details: http://ci-files01-hki.intra.qt.io:8080/coin/integration/qt/tqtc-qt5/tasks/1554463807

Tested changes (refs/builds/qtci/tqtc/5.13/1554463806):
https://codereview.qt-project.org/#/q/a0a847a8f362a1509527b659d80323afcf29e299,n,z Merge remote-tracking branch 'origin/5.13' into tqtc/5.13
https://codereview.qt-project.org/#/q/af1aa89981b6f74c3235dd3f6df3e3aedbd6dc72,n,z Update submodules on 'tqtc/5.13' in qt5