Handle no lens results

[IanWoodard]

Adding logic to handle and return early the case where there are no lens results when fetching a list of borrower nfts.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: earn/src/data/BorrowerNft.ts

Function	Unhandled Issue
fetchListOfBorrowerNfts	TypeError: Cannot read properties of undefined (reading 'callsReturnContext') fetchListOfB... Event Count: 12 Affected Users: 0

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[haydenshively]

We should investigate why the lens call is failing. That shouldn't happen.

[IanWoodard]

We should investigate why the lens call is failing. That shouldn't happen.

While I agree, it is failing, so we should have logic to handle such a case.

[haydenshively]

Turns out this happens because the multicall context has zero calls. To fix, we should change the enclosing if statement to look like this:

  // Fetch borrowers' in-use status and Uniswap pool, which we'll need for filtering
  if (
    (filterParams?.includeFreshBorrowers || Boolean(filterParams?.validUniswapPool)) &&
    borrowerManagerSets.size > 0
  )

(testing that the set is non-empty is the key)