[python-ldap] Memory leak fixes.

[Chris Mikkelson]

Two patches attached.

The first cleans up a previously-leaked object in a few
exception cases.

The second fixes a leak of an empty list for every
intermediate message, which was causing trouble in
a long-running ldap sync client.

-- 
Chris Mikkelson  | That is a form of errant pedantry up with which
cmikk at qwest.net  | I will not put. 
                 |                      -- Winston Churchill
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