I think that calling is the best situation here. Although river bet could be a blocker bet there is no point in raising here. Only a 7 will call u here and there are very few hands that will call and be worse 72,73,75,76,78 (5 hands) and 74,710,7A,7J,7Q,7K (6 hands) that beat you. Doesnt seem any point to risk it. Also, there is no real draw here so there is no real min-raise that is because of a draw. Take your licks and move on.