PGProblemEditor perltidy can error out on unused code.

[somiaj]

PG problems stop processing when they hit the first ENDDOCUMENT(); call, and sometimes authors will put older code after this. If that code has errors, the problem will run fine but formatting the code with perltidy will error out.

This is a very minor issue, but should perltidy also ignore all code after the first ENDDOCUMENT(); call, since it isn't being used anyways? Also would this also be an issue with the convert to PGML option, should it also ignore any code after the first ENDDOCUMENT();?