[Python-Dev] dummy __del__ in SocketServer.BaseRequestHandler

[Skip Montanaro]

Given that the presence of a __del__ method keeps the garbage collector from
reclaiming cyclic garbage, should SocketServer.BaseRequestHandler define a
__del__ method that just executes "pass"?  Commenting it out seems to have
gotten rid of some "uncollectable" messages from the garbage collector.
Every other __del__ method in the top level of the standard library actually
does something.

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