Spell Combat Defensive Casting

Magi using Spell Combat do not need to make a concentration check to cast defensively. It is assumed they are always casting defensively when using spell combat.

I'm adding this because it seems silly that the whole point of a magus is to cast a spell while fighting in melee. Requiring a check with a 50% chance of wasting the spell is as asinine as asking a fighter to roll a reflex save to not drop their weapon every time they attack, while only letting them use the weapon a few times a day.