Sheet collection creation

def create_sheet_collection(doc, name):
    t = Transaction(doc, "Create Sheet Collection")
    try:
        t.Start()
        collection = SheetCollection.Create(doc, name)
        t.Commit()
        return collection
    except Exception as e:
        if t.HasStarted():
            t.RollBack()
        forms.alert(
            "No se pudo crear la Sheet Collection:\n\n{}".format(e),
            title="Error"
        )
        return None