MLCP transform on triple data does not insert into output_graph without additional steps

When running MLCP transform on triple data the context argument does not contain any collections. I suspect this is because triplestore data uses the -output_graph argument instead of the -output_collection argument. This requires me to pass in the output graph using -transform_param so that I can assign collections to the context in the transform function.

function transform(content, context) {
  const graph = context.transform_param;

  // Document transform logic

  // Without this line, the resulting document is not put into a graph
  context.collections = [graph];

  return content;
}

Suggested fix: Use -output_graph argument value as context.collections if there was no -output_collection argument provided.