Core/MovementGenerators: Don't remove evade state when clearing unit states.

Core/Spells: Don't start combat when the target is evading.
Closes issue 1861

--HG--
branch : trunk

src/server/game/Spells/Spell.cpp

@@ -1321,7 +1321,7 @@ void Spell::DoAllEffectOnTarget(TargetInfo *target)
         }
     }
 
-    if (m_caster && !m_caster->IsFriendlyTo(unit) && !IsPositiveSpell(m_spellInfo->Id))
+    if (missInfo != SPELL_MISS_EVADE && m_caster && !m_caster->IsFriendlyTo(unit) && !IsPositiveSpell(m_spellInfo->Id))
     {
         m_caster->CombatStart(unit, !(m_spellInfo->AttributesEx3 & SPELL_ATTR_EX3_NO_INITIAL_AGGRO));