[9282] Possible fixed crash source added in [9228]
 

<pre>m src/game/Group.cpp
m src/game/ObjectMgr.h
m src/shared/revision_nr.h

[9282] Possible fixed crash source added in [9228]

After [9228] groups stored under leader guid keys, but group leader can change
and in result at group disband after leader change group not removed from storage.</pre>



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