Core/Spells: Add server-side check for spells that require combo points to prevent exploits

--HG--
branch : trunk

src/server/game/Spells/Spell.cpp

@@ -5728,6 +5728,10 @@ SpellCastResult Spell::CheckCast(bool strict)
                 return SPELL_FAILED_ITEM_ALREADY_ENCHANTED;
     }
 
+    // check if caster has at least 1 combo point for spells that require combo points
+    if (m_needComboPoints && m_caster->ToPlayer() && !m_caster->ToPlayer()->GetComboPoints())
+        return SPELL_FAILED_NO_COMBO_POINTS;
+
     // all ok
     return SPELL_CAST_OK;
 }