Though resaving without making any changes do not impact your Company data, it will give you an idea about the number of times the transaction or master was opened and resaved by the users without making any changes.
As resaving is an activity of re-accepting the data as is, and there is an update to the disk. Therefore, to be true to the update, the Resaved (No changes) activity is shown in the Edit Log report along with the Username and Date & Time of the action.