issue #8: Don't assume NGX_CONF_UNSET has a useful value
issue #8: Don't assume NGX_CONF_UNSET has a useful value


git-svn-id: d4152558efb2e408ec11f431866b6d3a2caf07f1@27 8c37197b-7511-e8b1-f9b8-afb3faca57d5

yaoweibin/nginx-sticky-module,jjungnickel/nginx-sticky-module