[Openais] corosync trunk - fix null dispatch handlers

[Steven Dake]

If a dispatch handler is undefined, the C compiler automatically defines
it to NULL. This is intended behavior.  The dispatch functions check
whether the value is NULL (meaning no action should be taken from the
library point of view) and call "continue".  This doesn't trigger the
dispatch_put operation locking up the cpg dispatch operations.  Instead
"break" should be called to exit the switch and allow normal processing
of the dispatch functions.

Regards
-steve

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