[FS#1050] LuCI web interface does not notice when WAN is disconnected

[LEDE Bugs]

The following task has a new comment added:

FS#1050 - LuCI web interface does not notice when WAN is disconnected
User who did this - Jo-Philipp Wich (jow-)

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The wan interface is a switch on this device so the netdev link is always up from the system pov. There is nothing that can be done from the LuCI side to fix this. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1050#comment3579