Fix NPE during dumpsys ethernet

Handle the case when IpClient wasn't created for network interface which
may happen for virtual device

Bug: 78482534
Test: dumpsys ethernet
Change-Id: I3405dd4f72d4a6444448f0d6ec0497aead07bade
1 file changed
tree: de535f49f870036a4a93399b1e986baee08c8745
  1. service-t/
  2. Android.mk