Fix issue where a downed lightning node would take down the API server

[danieldaquino]

Closes: #5

Tests

Added an automated test to cover this, and ensured it:

• fails without the fix
• passes with the fix

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📥 Commits

Reviewing files that changed from the base of the PR and between 4bb1035 and f538fab.

📒 Files selected for processing (2)

• src/invoicing.js
• test/ln_flow.test.js

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[danieldaquino]

CC @jb55