telephony: do only run setCellInfoListRate for RIL version >= 8
old libraries like those from MR0 don't support this and sending this command causes endless wakelocks

Change-Id: Ia47d366f70841eb9910079e105add407f58e7555
Fix NRE on sending multipart texts.

Watch for deliveryIntents, parts, and sentIntents being null.

This is based on http://review.cyanogenmod.org/#/c/46009/

Change-Id: I4abe2a2bd3e45bafde32de3a0c81576d742e4cee