Script/Misc: Fix two script crashes when spawned outside instance

also remove redundant null check in boss_lich_king_toc and an unused variable in npc_announcer_toc10
Closes #7785

src/server/scripts/Northrend/CrusadersColiseum/TrialOfTheCrusader/trial_of_the_crusader.cpp

@@ -120,11 +120,8 @@ class npc_announcer_toc10 : public CreatureScript
         {
             npc_announcer_toc10AI(Creature* creature) : ScriptedAI(creature)
             {
-                instance = creature->GetInstanceScript();
             }
 
-            InstanceScript* instance;
-
             void Reset()
             {
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE);
@@ -274,7 +271,7 @@ class boss_lich_king_toc : public CreatureScript
 
             void MovementInform(uint32 uiType, uint32 uiId)
             {
-                if (uiType != POINT_MOTION_TYPE)
+                if (uiType != POINT_MOTION_TYPE || !instance)
                     return;
                 switch (uiId)
                 {
@@ -338,20 +335,18 @@ class boss_lich_king_toc : public CreatureScript
                             if (GameObject* go = instance->instance->GetGameObject(instance->GetData64(GO_ARGENT_COLISEUM_FLOOR)))
                                 go->SetDestructibleState(GO_DESTRUCTIBLE_DAMAGED);
                             me->CastSpell(me, 69016, false);
-                            if (instance)
-                            {
                             instance->SetData(TYPE_LICH_KING, DONE);
                             Creature* temp = Unit::GetCreature(*me, instance->GetData64(NPC_ANUBARAK));
                             if (!temp || !temp->isAlive())
                                 temp = me->SummonCreature(NPC_ANUBARAK, AnubarakLoc[0].GetPositionX(), AnubarakLoc[0].GetPositionY(), AnubarakLoc[0].GetPositionZ(), 3, TEMPSUMMON_CORPSE_TIMED_DESPAWN, DESPAWN_TIME);
 
                             instance->SetData(TYPE_EVENT, 0);
-                            }
                             me->DespawnOrUnsummon();
                             m_uiUpdateTimer = 20000;
                             break;
                     }
                 } else m_uiUpdateTimer -= uiDiff;
+
                 instance->SetData(TYPE_EVENT_TIMER, m_uiUpdateTimer);
             }
         };

src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_keleseth.cpp

@@ -125,6 +125,7 @@ public:
 
         void Reset()
         {
+            if (instance)
                 instance->SetData(DATA_PRINCEKELESETH_EVENT, NOT_STARTED);
 
             events.Reset();
@@ -140,12 +141,14 @@ public:
         void EnterCombat(Unit* /*who*/)
         {
             me->SetInCombatWithZone();
+            if (instance)
                 instance->SetData(DATA_PRINCEKELESETH_EVENT, IN_PROGRESS);
             Talk(SAY_START_COMBAT);
         }
 
         void JustDied(Unit* /*killer*/)
         {
+            if (instance)
                 instance->SetData(DATA_PRINCEKELESETH_EVENT, DONE);
             summons.DespawnAll();
             Talk(SAY_DEATH);