Core: Do not use STL container size method to check if container is empty

src/server/scripts/Outland/BlackTemple/boss_bloodboil.cpp

@@ -144,7 +144,7 @@ public:
             // Get the Threat List
             std::list<HostileReference *> m_threatlist = me->getThreatManager().getThreatList();
 
-            if (!m_threatlist.size()) // He doesn't have anyone in his threatlist, useless to continue
+            if (m_threatlist.empty()) // He doesn't have anyone in his threatlist, useless to continue
                 return;
 
             std::list<Unit* > targets;

src/server/scripts/Outland/GruulsLair/boss_high_king_maulgar.cpp

@@ -776,7 +776,7 @@ public:
                         target_list.push_back(pTarget);
                     pTarget = NULL;
                 }
-                if (target_list.size())
+                if (!target_list.empty())
                     pTarget = *(target_list.begin()+rand()%target_list.size());
 
                 me->InterruptNonMeleeSpells(false);