Creature: Do not allow calling Creature::SetInCombatWithZone when AI …

…is not yet existant

Happens during Creature Create, all calls needs to be after spawning. We can not silently fail Creature::CallAssistance because it will lead to it not working
Closes cmangos/issues#2677
Closes cmangos/mangos-tbc#508

src/game/Entities/Creature.cpp

@@ -2122,6 +2122,8 @@ void Creature::CallAssistance()
     // FIXME: should player pets call for assistance?
     if (!m_AlreadyCallAssistance && GetVictim() && !HasCharmer())
     {
+        MANGOS_ASSERT(AI());
+
         SetNoCallAssistance(true);
 
         if (!CanCallForAssistance())
@@ -2313,6 +2315,12 @@ void Creature::SetInCombatWithZone(bool checkAttackability)
         return;
     }
 
+    if (!AI())
+    {
+        sLog.outError("Creature entry %u call SetInCombatWithZone but creature does not have AI. Possible call during create.", GetEntry());
+        return;
+    }
+
     Map* pMap = GetMap();
 
     if (!pMap->IsDungeon())