Replace `ifNil:[...]` with `isNil ifTrue:[...]`
The latter is optimized by compilers and therefore faster.
PPSmalltalkGrammar PPSmalltalkGrammar stx:goodies/petitparser/parsers/smalltalk 'PetitSmalltalk-Core' 0
PPSmalltalkParser PPSmalltalkParser stx:goodies/petitparser/parsers/smalltalk 'PetitSmalltalk-Core' 0
PPSmalltalkToken PPSmalltalkToken stx:goodies/petitparser/parsers/smalltalk 'PetitSmalltalk-Core' 0
PPSmalltalkTokenParser PPSmalltalkTokenParser stx:goodies/petitparser/parsers/smalltalk 'PetitSmalltalk-Core' 0
PPSmalltalkWhitespaceParser PPSmalltalkWhitespaceParser stx:goodies/petitparser/parsers/smalltalk 'PetitSmalltalk-Core' 0
stx_goodies_petitparser_parsers_smalltalk stx_goodies_petitparser_parsers_smalltalk stx:goodies/petitparser/parsers/smalltalk '* Projects & Packages *' 0