Remove assert on invalid incoming data

:Release Notes:
Remove assert on invalid incoming data

:Detailed Notes:
Parser of incoming messages used asserts to check type of fields

:Testing Performed:
Compiled successfully. Checked on the device

:QA Notes:

:Issues Addressed:
[GF-54192] Excessive crashes in luna-prefs /lib/libc.so.6(kill+0xc)

Open-webOS-DCO-1.0-Signed-off-by: Alekseyev Oleksandr<alekseyev.oleksandr@lge.com>

Change-Id: If23457f9a7441110053f12aa62044f06e3c56b41
Reviewed-on: https://g2g.palm.com/4135
Reviewed-by: DCO Verification
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Tested-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Reviewed-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>