tolerate LuaMapHandler scripts that don't return anything


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1490098 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1490099 13f79535-47bb-0310-9956-ffa450edef68