Core/Maps: Made instance_template no longer required to create and enter instance maps

src/server/game/Spells/Spell.cpp

@@ -6277,9 +6277,6 @@ SpellCastResult Spell::CheckCast(bool strict, uint32* param1 /*= nullptr*/, uint
                                     if (targetBind->perm && targetBind->save != casterBind->save)
                                         return SPELL_FAILED_TARGET_LOCKED_TO_RAID_INSTANCE;
 
-                        InstanceTemplate const* instance = sObjectMgr->GetInstanceTemplate(mapId);
-                        if (!instance)
-                            return SPELL_FAILED_TARGET_NOT_IN_INSTANCE;
                         if (!target->Satisfy(sObjectMgr->GetAccessRequirement(mapId, difficulty), mapId))
                             return SPELL_FAILED_BAD_TARGETS;
                     }