A few changes to make sure new exponential pricing works on Ropsten

[makoto]

• Do not show "undefined" when price oracle ens is not set
• Change oracle text record from ens.eth to .eth https://github.com/ensdomains/ui/pull/162

How to get released names on Ropsten

Run the following query on https://thegraph.com/hosted-service/subgraph/ensdomains/ensropsten

{
    registrations(first:5, where:{expiryDate_gt:"1641035869"}, orderBy:expiryDate){
    expiryDate
    labelName
  }
}```

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[makoto]

One thing I noticed is that the base price goes medium when I increase the renewal period on Tenderly mainnet fork whereas it's not happening on my locally deployed dataset.

To derive base fee the data it calls permanentRegistrarController.rentPrice with 1 year (getRentPrice) and with 0 year (getPremiumPrice) and I am doing the diff between the two.

{
  duration: 63113904,
  getRentPrice:         '487 818 043 070793161435',
  getPremiumPrice: '487 850 788 781227670488',
  diff: '-32745710434451456'
}

When I output the two, duration 0 rent price (getPremiumPrice) is more expensive than duration 1 year (getRentPrice)