If an error occured sending a "pretty" error page, and sending a plain error page results in an `IOError`, just ignore the error. Closes #1999.
If an error occured sending a "pretty" error page, and sending a plain error page results in an `IOError`, just ignore the error. Closes #1999.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@2267 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac