The rules just state that a unit must be within 12" of an enemy unit, but not within 3", and that they must end their charge within 1/2" of an enemy model (also, must be within 1" of each other, as per the unit cohesion rule). I'd say you can charge through a screening unit, if there is enough space to do so, but not walk through them. However, the unit cohesion rules will prevent you from behaving in the manner suggested in the image, as the models would be more than 1" from each other.
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