*Make auras with periodic power take cancel when there is no more power avalible.

--HG--
branch : trunk

src/game/SpellAuras.cpp

@@ -578,9 +578,16 @@ void Aura::Update(uint32 diff)
                 if (manaPerSecond)
                 {
                     if(powertype==POWER_HEALTH)
-                        caster->ModifyHealth(-manaPerSecond);
-                    else
+                    {
+                        if (caster->GetHealth()>manaPerSecond)
+                            caster->ModifyHealth(-manaPerSecond);
+                        else
+                            m_target->RemoveAurasByCasterSpell(GetId(),GetCasterGUID());
+                    }
+                    else if (caster->GetPower(powertype)>manaPerSecond)
                         caster->ModifyPower(powertype,-manaPerSecond);
+                    else
+                        m_target->RemoveAurasByCasterSpell(GetId(),GetCasterGUID());
                 }
             }
         }
@@ -5683,7 +5690,6 @@ void Aura::PeriodicTick()
 
             pCaster->SendSpellNonMeleeDamageLog(m_target, GetId(), pdamage, GetSpellSchoolMask(GetSpellProto()), absorb, resist, false, 0);
 
-
             Unit* target = m_target;                        // aura can be deleted in DealDamage
             SpellEntry const* spellProto = GetSpellProto();
             float multiplier = spellProto->EffectMultipleValue[GetEffIndex()] > 0 ? spellProto->EffectMultipleValue[GetEffIndex()] : 1;