* Kenyatta asked to be absent for parts of the trial
* African Union said ICC should postpone case
* Kenyatta and deputy accused over post-election violence (Adds diplomatic, analyst comments)
By Drazen Jorgic and Anthony Deutsch
NAIROBI/AMSTERDAM, Oct 18 (Reuters) - Judges at the International Criminal Court on Friday excused Uhuru Kenyatta from "continuous presence" at his impending ...