LCL: nicer error handlign

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45299 4005530d-fff6-0310-9dd1-cebe43e6787f
lazbuild: free Application early to see invalid GUI use early

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45300 4005530d-fff6-0310-9dd1-cebe43e6787f