SOPP649: I thought that if there is a pickup measure in a song that the last measure of the song and the first measure should add up to one measure

This question was sent by Bob, and he’s taking our Melodic Dictation Course Level 1.  He writes,

"Vidas,
I have a question about 4 kl. 280 in Melodic Dictation Week 9.
I thought that if there is a pickup measure in a song that the last measure of the song and the first measure should add up to one measure. But in this case there is a rest contained in the last measure, so the two measures do not add up to one measure. How do I decide whether I should add the rest or not? Or is it one of those times that it does not matter?
Thanks.
Bob"