Enforce the requirement that -check
chunks need an exercise.checker
#640
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Fixes #448 by throwing an error at render time if a
-check
chunk is defined but noexercise.checker
is present.An error is slightly heavy-handed, but this situation is almost certainly an oversight by the tutorial author: if they added a
-check
chunk they probably intend to check the exercise but have failed to loadgradethis
or another checking package. It's also hard to discover since the current behavior will still show the "Submit Answer" button, it just won't do anything (as described in #448).