current can only be null since this is a constructor and it hasn't been
previously set so simplify the code and remove a branch that will never
execute

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1634707 13f79535-47bb-0310-9956-ffa450edef68
If the exception is thrown then current will be null.
If current is null then popFile() is a NO-OP.
Since popFile() is only called in the exception handler it can be
removed. Also remove the other code the IDE marks as unused once
popFile() is removed.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1634708 13f79535-47bb-0310-9956-ffa450edef68