Merge topic 'exodus_writer_crash'

e7f053a4

 Fix crash in exodus writer when writing datasets
Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Robert Maynard <robert.maynard@kitware.com>
Reviewed-by: Berk Geveci <berk.geveci@kitware.com>
Merge-request: !1626

IO/Exodus/vtkExodusIIWriter.cxx

@@ -540,6 +540,11 @@ int vtkExodusIIWriter::FlattenHierarchy (vtkDataObject* input, const char *name,
       changed = true;
       }
     this->NewFlattenedInput.push_back (output);
+    if (!name)
+      {
+      // Setting an arbitary name for datasets that have not been assigned one.
+      name = "block";
+      }
     this->NewFlattenedNames.push_back (name);
     }
   else