Fixed NPE when local or remote port range does not exist

Added null check for local and remote port range.

Bug: 213523984
Bug: 213139361
Test: atest QosBearerSessionTest
Merged-In: Ic6bdeac05fedd02045d094fe2d1cbbaa7413208a
Change-Id: Ic6bdeac05fedd02045d094fe2d1cbbaa7413208a
3 files changed