[Bugfix][T106][task-view-165] after set testnumber to empty string, dial
normal call fail, lynq-ril-service crash

            Only Configure: No
            Affected branch: unknown
            Affected module: ecall
            Is it affected on both ZXIC and MTK: only ZXIC
            Self-test: yes
            Doc Update: no

Change-Id: Ibc61dfee8a17bc57cbdec7adffc6715e427c5b35
2 files changed