fixing issue when files directory is suddenly no longer writable
fixing issue when files directory is suddenly no longer writable

git-svn-id: http://svn.concrete5.org/svn/concrete5@1751 b0551a0c-1e16-4222-a7d5-975db1aca215

Former-commit-id: 7b6d9b93ae5a19b0bd2667ca24c2a065f1b80eb5
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