deal with preproc errors that go past the end of the code

Files:
modified: /trunk/processing/app/src/processing/app/debug/Compiler.java (try)
modified: /trunk/processing/todo.txt (try)
modified: /trunk/processing/app/src/processing/app/Sketch.java (try)
modified: /trunk/processing/app/src/processing/app/Editor.java (try)