Merge "[CTS] check if mSipMessage is null when sendmessage invalid" into main am: ca1b38408c am: bb070f14b0

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/2923870

Change-Id: I48b679d142c9e21be5646442643407acc9638a24
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>