Fix crash from missing spellInfo check in TogglePetSpellAutoCastAction (#2431)

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## Pull Request Description
<!-- Describe what this change does and why it is needed -->
I had repeated crashes upon login traced to line 89 of
TogglePetSpellAutoCastAction, where a spellInfo check is missing. I
confirmed that adding the check fixed my crashing.

I don't know why there was invalid spellInfo to create the crash, as
this missing check is not a new development and I never had a crash
before, but clearly this code should be fixed in any case.

## Feature Evaluation
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    - - [ ] Yes (**explain below**)



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conf/playerbots.conf.dist

@@ -495,22 +495,6 @@ AiPlayerbot.FleeingEnabled = 1
 #
 ####################################################################################################
 
-####################################################################################################
-# GREATER BUFFS STRATEGIES
-#
-
-# Min group size to use Greater buffs (Paladin, Mage, Druid)
-# Default: 3
-AiPlayerbot.MinBotsForGreaterBuff = 3
-
-# Cooldown (seconds) between reagent-missing RP warnings, per bot & per buff
-# Default: 30
-AiPlayerbot.RPWarningCooldown = 30
-
-#
-#
-####################################################################################################
-
 ####################################################################################################
 # CHEATS
 #

src/Ai/Base/Actions/GenericActions.cpp

@@ -86,7 +86,7 @@ bool TogglePetSpellAutoCastAction::Execute(Event /*event*/)
 
         uint32 spellId = itr->first;
         const SpellInfo* spellInfo = sSpellMgr->GetSpellInfo(spellId);
-        if (!spellInfo->IsAutocastable())
+        if (!spellInfo || !spellInfo->IsAutocastable())
             continue;
 
         bool shouldApply = true;

src/Ai/Class/Warrior/Action/WarriorActions.cpp

@@ -5,6 +5,7 @@
 
 #include "WarriorActions.h"
 
+#include "AiFactory.h"
 #include "Playerbots.h"
 
 bool CastBerserkerRageAction::isPossible()
@@ -36,6 +37,27 @@ bool CastBerserkerRageAction::isUseful()
 
 bool CastSunderArmorAction::isUseful()
 {
+    Group* group = bot->GetGroup();
+    if (!group)
+        return false;
+
+    if (!botAI->IsTank(bot, false))
+    {
+        for (GroupReference* ref = group->GetFirstMember(); ref; ref = ref->next())
+        {
+            Player* member = ref->GetSource();
+            if (!member || member == bot || !member->IsAlive() || !member->IsInWorld() ||
+                member->GetMapId() != bot->GetMapId())
+            {
+                continue;
+            }
+
+            if (member->getClass() == CLASS_WARRIOR &&
+                botAI->IsTank(member, false))
+                return false;
+        }
+    }
+
     Aura* aura = botAI->GetAura("sunder armor", GetTarget(), false, true);
     return !aura || aura->GetStackAmount() < 5 || aura->GetDuration() <= 6000;
 }

src/Ai/Class/Warrior/Strategy/ArmsWarriorStrategy.cpp

@@ -112,6 +112,7 @@ std::vector<NextAction> ArmsWarriorStrategy::getDefaultActions()
     return {
         NextAction("bladestorm", ACTION_DEFAULT + 0.2f),
         NextAction("mortal strike", ACTION_DEFAULT + 0.1f),
+        NextAction("sunder armor", ACTION_DEFAULT + 0.05f),
         NextAction("melee", ACTION_DEFAULT)
     };
 }