[racket-dev] okay to add planet error check?

Currently, raco planet does not signal an error on the removal of a nonexistent link:

pcp070580pcs:~/sxml clements$ raco planet unlink frooty bogus.plt 3 4
pcp070580pcs:~/sxml clements$ 

Anyone mind if I change the code to signal an error in this case?

John Clements

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