When run.out is missing in &grade_test, just return an error that
authorBen Pfaff <blp@cs.stanford.edu>
Thu, 17 Mar 2005 18:51:58 +0000 (18:51 +0000)
committerBen Pfaff <blp@cs.stanford.edu>
Thu, 17 Mar 2005 18:51:58 +0000 (18:51 +0000)
preparation failed, instead of dying.  This can happen legitimately
when a `pintos put' fails.


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