Fixed codegen for empty (mapped) action block.
Although empty blocks are useless in practice, they may occur (and do occur in tests)
"{ Package: 'stx:goodies/petitparser' }"
PPParser subclass:#PPStartOfLine
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitParser-Parsers'
!
!PPStartOfLine methodsFor:'parsing'!
parseOn: aPPContext
(aPPContext isStartOfLine) ifTrue: [
^ #startOfLine
].
^ PPFailure message: 'Start of line expected' context: aPPContext at: aPPContext position
! !