Don't return from Spell::DoSpellHitOnUnit if all effects were handled…

… at launch

The check remains since the time when the method had nothing but a loop with HandleEffets and served only for optimization. Now it prevents another code from executing for some delayed spells.

refs cmangos/mangos-classic#194

src/game/Spell.cpp

@@ -1212,7 +1212,7 @@ void Spell::DoAllEffectOnTarget(TargetInfo* target)
 
 void Spell::DoSpellHitOnUnit(Unit* unit, uint32 effectMask)
 {
-    if (!unit || !effectMask)
+    if (!unit)
         return;
 
     Unit* realCaster = GetAffectiveCaster();