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
Merged-In: I374a91265660e814b4f0f033b3970fd98921ca84
Merged-In: Id4ab7c9a8a5238491c8405ae260862e76a7671c1
Change-Id: I3405dd4f72d4a6444448f0d6ec0497aead07bade
(cherry picked from commit 2c002de63839a7ce1ed334af2c75176c00e1e248)
1 file changed
tree: 328cb454e6d61f607f68d3eab2ff610f0e0ce74e
  1. java/
  2. Android.mk