Fix potential NPE

Change-Id: Ic2c7243601b0830e0532818b2f4007d9c10e0de8
InCallUI: EL translations

Change-Id: I837b1de9f5c2c7d7114033ccc7d62ca0f6fb42d8
InCallUI: NL translation

ps1: STK Call Control feature implementation.

ps2: IMS support for UI interface

ps3: Add support for video calls

ps4: DSDA: Add InCallUI DSDA support

Change-Id: I386c64e6ed6ca4e312537947d909bc83d2c1193d
InCallUI_cm_strings: AST translations

Change-Id: I61275e30cd77aea4144d79e14118fd058b7cd236
InCallUI: UG translation

Change-Id: Ie1c053b51ab466462736eac94705b7244ebf7fc0
InCallUI: AST translations

Change-Id: I80e3c0a04a8e83ff510dc444aad7e9b55d92b2cd
InCallUI: ES translations

- CAF refactor

Change-Id: I38601d730d5e52a27c7d7a939479859853397094