message: Don't allow HTML pipeline export with no capture loaded
diff: @@ -202,6 +202,9 @@ void PipelineStateViewer::setToVulkan()
  QXmlStreamWriter *PipelineStateViewer::beginHTMLExport()
  {
  + if(!m_Ctx.IsCaptureLoaded())
  + return NULL;
  +
  QString filename = RDDialog::getSaveFileName(this, tr("Export pipeline state as HTML"), QString(),
  tr("HTML files (*.html)"));
  