In this exercise, the data is obtained using calls of the format
get_link_node().get_value(). What will happen if
get_link_node() returns a
None in this case?
In the event that
None and there is no check before
get_value() is called, then the following error will be returned by Python during runtime. As a general rule, it is best to check that a valid link is returned before attempting to access the data.
AttributeError: 'NoneType' object has no attribute 'get_value'