Fix crash issue for VTS setupDataCall_1_6_osAppId

- donot check the osAppId for response if trafficDescriptors is empty
  due to no matching rule found

Bug: 181187711
Test: *
run command => atest VtsHalRadioV1_6TargetTest -- --test-arg com.android.tradefed.testtype.GTest:native-test-flag:"--gtest_filter=*slot1")
and check the test result is PASSED
[2/18] PerInstance/RadioHidlTest_v1_6#setupDataCall_1_6_osAppId/0_slot1: PASSED (24ms)

Change-Id: Ic65b7a0eecc14a142ea69c2774344d9b601298fb