IDE: warn for invalid lines in lazarus.cfg

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42709 4005530d-fff6-0310-9dd1-cebe43e6787f
lcl: there is no need to check something for nil before .Free call

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42710 4005530d-fff6-0310-9dd1-cebe43e6787f