Add null check for the parameter CallerInfo in onCallerInfoQueryComplete

When there is no handle or phone number in outgoing call like voicemail, the parameter CallerInfo can be null value and it can make NPE.
There is annotation @Nullable for it in interface also.

Test: Make call with no handle or no phone number like voicemail which has only scheme for voicemail

Bug: 144319080
Change-Id: Iaf28bcf17c88b8f60a7a8f644169529cf9e03071
Signed-off-by: Junyeong Bak <junyeong.bak@samsung.com>