The delegationsAndRewards handler crashes on an empty response

[vsubhuman]

What Git revision are you using?

4416988

What operating system are you using, and which version?

Unrelated

Describe what the problem is?

The delegationsAndRewards query in the client assumes at least one entry must be in the response by calling this function:

ogmios/clients/TypeScript/packages/client/src/StateQuery/queries/delegationsAndRewards.ts

Lines 15 to 17 in 4e2ae0e

	const isDelegationsAndRewardsByAccounts = (result: Ogmios['QueryResponse[delegationsAndRewards]']['result']): result is DelegationsAndRewardsByAccounts => {
	const sample = Object.entries(result as DelegationsAndRewards)[0]
	return typeof sample[0] === 'string' && (sample[1].delegate !== undefined || sample[1].rewards !== undefined)

In case if the requested address has no rewards and has no delegation - the response is an empty object. In this case the entry variable in the function is undefined and then the call entry[0] fails with an exception.

What should be the expected behavior?

Expecting that it will return the empty response object with no entry for that address, or insert an empty entry, idk.

Workaround

Working around that by just doing the query manually atm and doing the handling on our side.