Previously, we use the first router address, and if it is null, we ignore the address. Now, we use the first non-null address. That is, if the first router address is null, but the second is not, then we use the second one. That should not cause functional change in most cases, except for the case when a DHCP server provides such spurious reply. This is mostly for refactoring and preparation for later commits.
System and Service Manager
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