Lm predict forward no labels in matrix

[silil]

Modify the builders.py component to deal with the use case of not having labels on the matrix (predict forward). In case there are no labels, a CSV file is generated with 0s in it. This change follows the logic on tag 5.2.3.

It was tested with DoJo data using the predictlist logic:

• Using only the predict_forward_with_existed_model
• Using the Retrainer object with retrain and predict methods