MUC room sends incorrect role 'none' (#132)

In QA

	Andrzej Wójcik (Tigase) opened 4 years ago Issue reported at GitHub: https://github.com/tigase/tigase-muc/issues/2 That happens when one of the clients joined to the room under the same nickname leaves while others are still available. In that case, a new presence is broadcasted to each of the occupants with `role` set to `none` instead of actual role of still joined occupant clients.
	Andrzej Wójcik (Tigase) commented 4 years ago Fixed issue by sending correct role instead of `none` in this case,

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Reference

tigase/_server/tigase-muc#132