Re #11711 Fix crash when data has not been set

Code/Mantid/MantidQt/CustomInterfaces/src/Muon/ALCBaselineModellingModel.cpp

@@ -96,7 +96,7 @@ namespace CustomInterfaces
 
   MatrixWorkspace_sptr ALCBaselineModellingModel::exportWorkspace()
   {
-    if ( m_data->getNumberHistograms() == 3 ) {
+    if ( m_data && m_data->getNumberHistograms() == 3 ) {
 
       // Export results only if data have been fit, that is,
       // if m_data has three histograms

Code/Mantid/MantidQt/CustomInterfaces/src/Muon/ALCPeakFittingModel.cpp

@@ -19,7 +19,7 @@ namespace CustomInterfaces
 
   MatrixWorkspace_sptr ALCPeakFittingModel::exportWorkspace()
   {
-    if ( m_data->getNumberHistograms() == 3 ) {
+    if ( m_data && m_data->getNumberHistograms() == 3 ) {
 
       return boost::const_pointer_cast<MatrixWorkspace>(m_data);