PIM-3545 Update media value setter to handle null value
PIM-3545 Don't apply data changed in mass edit for validation if the form is already invalid
PIM-3545 Allow null value in metric value setter
PIM-3545 Update simple select value setter to handle null value
PIM-3545 Fix undefined index in structured attribute option normalizer
PIM-3545 Allow null value in number value setter
PIM-3545 Allow null value in price value setter