Added IOError arounf call to openlogfile in ccopen, which returns None.
Added IOError arounf call to openlogfile in ccopen, which returns None.

git-svn-id: d468cea6ffe92bc1eb1f3bde47ad7e70b065426a@484 5acbf244-8a03-4a8b-a19b-0d601add4d27

Clyde-fare/cclib_bak,Clyde-fare/cclib_bak