Refs #14936 Correction to MWView constructor

MantidQt/MantidWidgets/src/MWView.cpp

@@ -28,7 +28,7 @@ namespace MantidWidgets {
 MWView::MWView(QWidget *parent)
     : QWidget(parent),
       m_mdSettings(new MantidQt::API::MdSettings()),
-      m_workspace{nullptr},
+      m_workspace(),
       m_dimensions() {
   m_spect = new QwtPlotSpectrogram();
   m_data = new MantidQt::API::QwtRasterDataMD();