Merge pull request #4229 from devilcoredev/fix_002

Core/Spells: Fix the spell immunity system to be effect-dependent

src/server/game/Spells/Spell.cpp

@@ -1562,7 +1562,7 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit* unit, const uint32 effectMask, bool
     }
 
     for (uint32 effectNumber = 0; effectNumber < MAX_SPELL_EFFECTS; ++effectNumber)
-        if (effectMask & (1 << effectNumber))
+        if (effectMask & (1 << effectNumber) && !unit->IsImmunedToSpellEffect(m_spellInfo, effectNumber)) //Handle effect only if the target isn't immune.
             HandleEffects(unit, NULL, NULL, effectNumber, SPELL_EFFECT_HANDLE_HIT_TARGET);
 
     return SPELL_MISS_NONE;