util.filters: Break processing if a filterer returns nil

util.filters: Don't traceback with no filters of a type added

net.multiplex_listener: Test to make sure listener.onconnect isn't nil.

net.multiplex_listener: Call listener.onconnect(conn) when swapping listeners.

xmppclient_listener: Port to onconnect handler

util.filters: Don't traceback when trying to remove a filter from an uninitialized object

util.filters: Expose the initialization function

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mercurial