Since there still seems to be some uncertainty about this, let me try to explain again.
In PA we vote for a delegate linked to a candidate. All votes for a particular candidate's delegates by district are essentially allocated to that candidate, and delegate numbers are assigned based on the total vote share each candidate receives. It's true that Clinton's failure to have a full delegate slate is unlikely to affect the actual allocation of delegates, but there still could be some impact on number of votes received. There will be fewer Clinton spaces on the ballot.
Not the biggest deal in the world, but still a campaign failure. There is a reason candidates actually bother to try to get names on the ballot.
