Code Review 6977851: NPE from FileURLConnection.connect

[Chris Hegarty]

Michael,

The file handler can fail with NPE in cases where permission is denied 
to the directory. Small change, throw FileNotFoundException where a 
directory listing is not available.

Webrev:
   http://cr.openjdk.java.net/~chegar/6977851/webrev.00/webrev/

Thanks,
-Chris.