GraphQL error while sending payments

[dasquantum2909]

Describe the problem/bug
Whenever I try to send payments I am receiving graphql error

Your environment

• Version of ThunderHub: 0.13.18
• Deployment method: using umbrel bundled package
• Other relevant environment details: RPI4, ubuntu, umbrel lightning node

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Home'
2. Click on 'send'
3. Provide invoice
4. Select the out channels
5. See error- Graphql error

Expected behavior
It should send the payment

Actual behavior
Throws graphql error
{"graphQLErrors":[],"clientErrors":[],"networkError":{"name":"ServerError","response":{},"statusCode":400,"result":{"errors":[{"message":"Variable \"$out\" got invalid value null at \"out[0]\"; Expected non-nullable type \"String!\" not to be null.","locations":[{"line":1,"column":52}],"extensions":{"code":"BAD_USER_INPUT"}}]}},"message":"Response not successful: Received status code 400"}

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Additional context
Add any other context about the problem here.

[aphex3k]

This is actually a network/server error instead of GraphQL if you look at the error message more closely. I described the same behavior in #508

[apotdevin]

Fixed with #531