Prevent hot patch from leaving devserver in BuildError state #4784
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Scenario: without this patch, if you fail a build, fix the code, let the thin build succeed, and then refresh the browser... then after reloading the browser page, it gets stuck on the "One sec" loader because the devserver status never clears the earlier BuildError. Prior to this patch, only a full rebuild fixes it.
This PR is tested, working correctly in other exercises including error, and found to fix the issue.