BETA: Fixing NPEs caused by setting owner of `L2Summon` to null.
	* Reported by: Sdw
	* Patch by: Sdw

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6526 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad
Merge remote-tracking branch 'git-svn' of ../../L2j-svn/L2J_Server_BETA into svn