ethernet: IpConfigStore#readIpConfigurations() can return null

If the version is invalid IpConfigStore#readIpConfigurations() will
return null, in which case ArrayMap#putAll() will throw an NPE.
Log and return instead.

Bug: 241588375
Test: TH
Change-Id: I1d7278f9571164a95ce21cb92e1219558cb1569f
1 file changed