Missing user-editable header / footer error handling. #420
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…tive error message and exit immediately.
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Addresses #418
Summary of changes:
This just implements the behavior that we would expect if the user-editable header and footer were mandatory but missing for whatever reason. If this is off-spec or not the case, please ignore this and close #418.
I wrote this mostly because I had to to debug my own migration issue, so I thought I'd share. :)