Fix tst_blackbox for machines without nodejs
Fix tst_blackbox for machines without nodejs

Change-Id: I7c7f04b5128ea448decf1c8d71790111607398b0
Reviewed-by: Jake Petroules <2d627e1cecd5435752fa500bacbe05f7cc90c369@theqtcompany.com>
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@theqtcompany.com>

qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs