codetools: sourcechanger: direct no change: exit immediately

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42638 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: package editor: disable Compile button if pacackage has no commands

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42639 4005530d-fff6-0310-9dd1-cebe43e6787f