message: Check validity on the multidomain mesh Node.
diff: @@ -409,8 +409,7 @@ public:
  /// Checks whether the blueprint is valid and prints diagnostics
  bool isValid() const
  {
  -#if 0
  - if(numPoints() > 0)
  +#if 1
  {
  conduit::Node meshNode;
  m_group->createNativeLayout(meshNode);
  @@ -424,6 +423,7 @@ public:
  }
  return true;
  #else
  + // This is old. It only checks the first child node.
  conduit::Node mesh_node;
  // use an empty conduit node for meshes with 0 elements
  