Rename 2014_04_19_world_misc.sql to 2014_04_19_00_world_misc.sql
Core/Misc: Ensure GetVictim() returns a valid reference when expected

Add a new method EnsureVictim() which asserts a valid not NULL reference will be returned to the caller. Use this whenever the GetVictim() would be dereferenced .
Core/Misc: Check GetVictim() for NULL before dereferencing it

Add additional NULL checks all around the code before dereferencing GetVictim() result.
Keep in mind UpdateVictim() result has nothing to do with GetVictim() result and the caller shouldn't assume anything about GetVictim() based on UpdateVictim().
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/server/scripts/Northrend/Naxxramas/boss_gluth.cpp