+ if (myArray.IsNull() || !myArray->IsValid()) {
+ // this could be on undo and then redo creation of the attribute
+ // in result creation it may be uninitialized
+ myIsInitialized = myLab.FindAttribute(TDataStd_IntegerArray::GetID(), myArray) == Standard_True;
+ }
+ // checking the validity because attribute (as a field) may be presented,
+ // but without label: it is undoed
+ return (myArray.IsNull() || !myArray->IsValid()) ? 0 : myArray->Length();