This reverts commit f09ab88891, reversing
changes made to effc761e0e.
This is being temporarily reverted to make it easier to release an
urgent fix for v10.15.1.
* If there is no array of top assets in a response, use an empty array
* Set a default empty array for 2 functions, remove an unnecessary condition
* Redirect a user from Swaps to the homepage if they switch to a chain that is not supported in Swaps
* Fix errors in the UI Console when it's not a swaps chain