9532af4dd52b69bd1ea22cd0d8ccb7c28bcabbd7
on UNIX, "mail.directory" is always set. on windows, it may be set to "" add the PL_strlen test to tree "" as not being set, so we assume the default 4.x location, which is what we want. git-svn-id: svn://10.0.0.236/trunk@47160 18797224-902f-48f8-a5cc-f745e15eee43
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