Core/Auras: backout r2bf34fd7ac and add alternative - not spell specific sollution for the problem.

--HG--
branch : trunk

src/server/game/Spells/SpellScript.cpp

@@ -567,6 +567,7 @@ bool AuraScript::_IsDefaultActionPrevented()
         case AURA_SCRIPT_HOOK_EFFECT_PERIODIC:
             return m_defaultActionPrevented;
         default:
+            ASSERT(false && "m_defaultActionPrevented has incorrect value, or AuraScript::_IsDefaultActionPrevented is called in a wrong place");
             return false;
     }
 }