Mapping check file type

Added a type of file check to assure no crash when the file isn't readable

src/plugins/editing/MappingView/src/mappingviewplugin.cpp

@@ -24,6 +24,7 @@ along with this program. If not, see <https://gnu.org/licenses>.
 #include "coreguiutils.h"
 #include "mappingviewplugin.h"
 #include "mappingviewwidget.h"
+#include "filemanager.h"
 
 //==============================================================================
 
@@ -294,6 +295,17 @@ QWidget * MappingViewPlugin::viewWidget(const QString &pFileName)
 {
     // Update and return our Mapping view widget using the given file
 
+    // Make sure that we are not dealing with a new file, but a CellML 1.0/1.1
+    // file
+
+    CellMLSupport::CellmlFile::Version cellmlVersion = CellMLSupport::CellmlFile::fileVersion(pFileName);
+
+    if (   Core::FileManager::instance()->isNew(pFileName)
+        || (   (cellmlVersion != CellMLSupport::CellmlFile::Version::Cellml_1_0)
+            && (cellmlVersion != CellMLSupport::CellmlFile::Version::Cellml_1_1))) {
+        return nullptr;
+    }
+
     mFileName = pFileName;
 
     mViewWidget->update(pFileName);

src/plugins/editing/MappingView/src/mappingviewwidget.cpp

@@ -119,7 +119,7 @@ void MappingViewWidget::update(const QString &pFileName)
     // Retrieve the requested CellML file
 
     mCellmlFile = CellMLSupport::CellmlFileManager::instance()->cellmlFile(pFileName);
-
+    //TODO can be null
     populateCellmlModel();
 }