should an error in the cla bot execution render a check on PRs?

Right now, if a promise fails in checker.js, it returns an error. Instead, maybe we should still run a failed check on github?

Start in checker.js and trace the promise-failure path to understand how the CLA check currently reports errors. Confirm how the GitHub App renders checks on pull requests; the work is done when an execution error produces a failed check rather than only returning an error.

Written by the indexing model from the issue text.