Add ListenerManager.onListenersListEmptied() to be able to react when no more listeners are registered
This allows for situations where one has a comet-master-server which book-keeps a list of servers (typically in a Map) and one wants to remove the comet-server from the map when no more listeners are present.
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(In revision:ddf1cb844898181341ecb2d7b5050a8cdfae5a6f) Closes #1140 Added onListenersListEmptied() to ListenerManager to be able to react when listerners-list is emptied
Branch: master
Branch: master